Malicious PDF — malware analysis report

Static analysis result for SHA-256 26649e4796f6ae3c…

MALICIOUS

PDF

90.9 KB Created: 2021-03-31 21:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5ca22a6f0882431a3d308b7a3500c757 SHA-1: 766b8afaa33c6e63a44fba6a9a03f8f580581a55 SHA-256: 26649e4796f6ae3cea086a623f34a96afde03730c8dfcbd2875a708b64fecb6b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to distribute malware or phish for information. The document body, though heavily obfuscated, appears to be a lure related to 'Java beginners pdf free download', aiming to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://golowaki.ru/award?keyword=java+beginners+pdf+free+download PDF link annotation
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/02238.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/vectors_equations_of_lines_and_planes.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/glands_in_human_body_and_their_functions_download.pdfIn PDF document text
    • https://zesuloni.weebly.com/uploads/1/3/4/8/134892945/newud-femawazo-kulugaxikanap-ditowibowuno.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/56c87927a.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/be11da.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/penatalaksanaan_anemia_defisiensi_besi_pada_anak.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/ipcc_synthesis_report_2017.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
    • http://fakozavovenabe.rf.gd/ananda_bhairavi_kannada_movie_songs_free.pdfIn PDF document text
    • http://sagolitoru.rf.gd/dujezakazewib.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_7ce4936ffd94472094a30a9cb247cb4b.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_40c8125adb7f4fe7ac6bcd6bb30c1827.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_b947be7c483445edb2942f60561f90db.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_0560a16e264b45298dad69cef386065a.pdf?index=trueIn PDF document text
    • http://fujaled.epizy.com/tapimabitivupudim.pdfIn PDF document text
    • http://luviwozota.rf.gd/spring_boot_resttemplate_error_handling.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/ruwaledugepozokuretega.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_c75674a47ea249ec94461efae3c25e3a.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_c7b34e7fba8d45c4845b9e85c4dbd02c.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_3ffb80cdf8a24288ba815707edd5d46a.pdf?index=trueIn PDF document text
    • http://lipewolitaden.epizy.com/pizajefiwejurapidakubinu.pdfIn PDF document text
    • http://dukuzuwikisos.epizy.com/english_family_words_worksheets.pdfIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_6865127d3b1848b086b959a004ba56a5.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_d6f20dcf8e8340ab99052d80abafb2b1.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 5200 bytes
SHA-256: a8401b7c51c0426107f02863e78dc2da9be9066037886bcfccf5745abdbc59e4
font_01_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 10844 bytes
SHA-256: 1e010a09403ea03eed6b6c67be5ddb6d542e69cee4fcb6cac1baa365ce09151b
font_02_sfnt_off00014ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176