Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c762721cc271273…

MALICIOUS

PDF

106.6 KB Created: 2021-03-22 08:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 041ab4eb555a7e69c58eba6067af2198 SHA-1: b15eece12fc3e479087d8bae3cdaf6d0ccf5d97d SHA-256: 1c762721cc271273266a156096e595bb96a341460fd28f2c2c6f6a4228d646f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://dafemum.ru/wix?keyword=evony+the+king%2527s+return+attack+guide'. The document body, though heavily obfuscated, suggests a lure related to a game guide, likely to trick users into clicking the malicious links. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=evony+the+king%2527s+return+attack+guide In PDF document text
    • http://xasowokudat.medianewsonline.com/90967018790.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/ihsUha2/22732796153.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/NjbCJij/20479075528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_605403ccd47d8.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/idn1uvB/figimi.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/how_to_locate_a_furnace_filter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_604ee826f3b04.pdfIn PDF document text
    • https://cdn.sqhk.co/fokaladanolo/AjdzNZq/chinese_dramas_to_watch_on_netflix.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/characteristics_of_executive_information_system.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_539566c5c8d44ea08dd8add676a48113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/180a5dde-a9e3-430a-9208-e79df37eee18/10967583600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75adcee5-fbc0-4897-a8af-0e030ab3cf4f/what_does_high_fertility_rate_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/lego_ninjago_movie_video_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/93908360770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1f203a-bbaf-4363-86b3-e58b9cbcd16f/xajotujukawuvofugadoj.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/the_crc_encyclopedia_of_mathematics_third_edition.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f656c92caf904d0d804183ccb72dba5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/59875278028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8a5876-f842-4879-ac7d-54ac6a212340/descargar_resumen_edipo_rey.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/menibakasiwofilin.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_306c51b90eb74576a224bfda22483c3e.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_8c5e0ce22c5a4fdfad5816c76acd1bfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/41341346491.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_d987a3b398024b8bafef67ad22f78cb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b70063-3148-4cb4-93be-776948e2dce8/tc_helicon_harmony_singer_2_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/mepivipewafizi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 9748 bytes
SHA-256: f59b4a6b9fc02515c0d272e4698c8e4a5269bd385a7a469cc9c8157f67e1bb70
font_01_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 5268 bytes
SHA-256: 10276ea9d1b1ce4098f82cb63c2b65a4a4001104f03ab9419adb29376e8fc014
font_02_sfnt_off00015047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 11552 bytes
SHA-256: b1abd23a514f3cf6b0b1f0ba6e9b5541c98a7adb25e84c30627742a646e73dbc
font_03_sfnt_off000177e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E1 16336 bytes
SHA-256: e06fba4164ac16c165214f5f4232651daafdc404a58c7e7d1ab12f636b0c6cc1
font_04_sfnt_off00018d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71