Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ffe8252c71737b…

MALICIOUS

PDF

82.5 KB Created: 2021-04-07 13:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be6cad7f78311d5c94109ddd9273f11d SHA-1: 72f9edcd2ba22d895e56ea94aad9a9a9d6cf248f SHA-256: e0ffe8252c71737b2774e72c511d1b94266b48024a906337599f20c32ca8ab51
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=20+verbos+regulares+en+ingles+en+pasado+y+presente In PDF document text
    • http://zdorovie-vashe-vse.xyz/the_over_40_hormone_reset_diet_book_shaun_hadsallpt704.pdfIn PDF document text
    • http://romeital.space/mcgraw_hill_ryerson_answersn03tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fd7dd903c51c.pdfIn PDF document text
    • http://kezerojipogut.iblogger.org/mebutosomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6011e5e032409.pdfIn PDF document text
    • http://melotedi.iblogger.org/wefigo.pdfIn PDF document text
    • http://about-fb-support.com/skyrim_mods_to_avoidd08kl.pdfIn PDF document text
    • http://livecopyrightverification.com/9630430660457apu.pdfIn PDF document text
    • http://sberin.xyz/1008_names_of_lord_vishnu_downloadxrdbm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab4e535-833b-44c5-aad2-31c07253ddb0/61024757400.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/argininosuccinic_aciduria.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_a0a18cca6409454d93b6594a818ce1a4.pdf?index=trueIn PDF document text
    • http://lunowakaneruf.rf.gd/26626729786.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/organization_structure_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ede91c8-ebac-4a3b-af50-1ffd70ed848f/end_of_the_world_as_we_know_it_chords_lyrics.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_9e2e27e7266340b4b0922f3400c5aaf3.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_593156bd53ee41ff8bb4c6ff2d1426f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/13414433288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad16df9-b22d-487c-ad08-ab1abc954e7a/the_witcher_book_series_release_order.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_163a96d1debb43dabcae74b640b2f23c.pdf?index=trueIn PDF document text
    • http://lutagikeni.rf.gd/which_room_heater_is_best.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_ff8b835a18a548bbb31f09f16f162ea8.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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 5608 bytes
SHA-256: 53cae6fb24c024a1de7af9986eb2d4cdee9da6e6a382489dab0daac4e60cc15e
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 4440 bytes
SHA-256: 4facd9e79e6038499080644d61eeb07d84a478d508289e365eaad95afaa75cd6
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 11896 bytes
SHA-256: b116a3ba79849856c9355c33dd071ddd94014b74213644a94d30b2806dd03ea0