Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea86a79b874a41eb…

MALICIOUS

PDF

100.3 KB Created: 2021-04-05 11:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6f029689712859a0b9b11a2591ba7134 SHA-1: e8ff6d5faad9d70b7d069bf6291ec2bd5396dc9e SHA-256: ea86a79b874a41ebdc7b3cbe461acb9afbea9fca847089af67d9616e271b00b7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=home+design+brochure+pdf PDF link annotation
    • http://virulakud.iblogger.org/xonowubovubixuginuga.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/alcohol_abuse_essay.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/how_to_solve_division_problems_step_by_step.pdfIn PDF document text
    • http://vugewanir.22web.org/14166162186.pdfIn PDF document text
    • http://gupilan.iblogger.org/accounting_standard_2_icai.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/zapizebezu.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/analysis_of_survey_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_c2e80c2d74dd4b8cbd700ae7058b3327.pdf?index=trueIn PDF document text
    • http://rusireges.epizy.com/zaratustra_nietzsche.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_c4723806a8154830a49bb778499afc35.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_de52d4a9cab74d1e8a226c06cd366e05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9e256-38ca-48c0-835e-d8be99e26c97/whirlpool_duet_steam_washer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4790a7-0c93-434a-9dfb-221d5fd15fcb/89075792332.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_6372d908f0f04c00bde31a6b824e9315.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f99fa1-1e79-49aa-8c16-9c66e1bff0f7/the_secret_life_of_the_american_teenager_season_4_episode_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cbe711-2953-465c-a648-fb9be13dd6df/where_can_i_watch_twilight_online_for_free_quora.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/90890520098.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_9f1bef83e0234651980b0e070aed2bb9.pdf?index=trueIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_cc7c3f76525e4b769636fd76f86640f2.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_b07102d08fb044c58fc18354048c1abd.pdf?index=trueIn PDF document text
    • http://samesejozigima.rf.gd/princess_diaries_3.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/87133479940.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_a73f09f78848487dab1f5ab715ab4315.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_18a452753ab54ef6b494a2d7861d8259.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C84 5428 bytes
SHA-256: e9b934be78d6259a171057c484c11bc6c889035d5d7f78e2ca4d0564a94097b9
font_01_sfnt_off00015ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECD 10988 bytes
SHA-256: 1f4660e36687520a0da5d53edba25646791d7ec212e5a8dc6d3393d6bf627c12

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