Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a28a3ac29dfd29…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 06:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d3e74a8cecd71940baf0d114db828f54 SHA-1: 26f2069d20ac24ccd4fdd23e05409ed06e9f5d8c SHA-256: e7a28a3ac29dfd29d22d989fbc318419af2831ba94872adc4d64209f368fa2f6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/wix?keyword=cheap+toy+drift+cars PDF link annotation
    • http://madamzero.com/demonstrative_pronouns_worksheets_for_grade_3fvaw6.pdfIn PDF document text
    • http://help-verification.com/limitations_of_non_conventional_energy_sourcesiso92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6062b9e815fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ffb9eadbb4c4.pdfIn PDF document text
    • http://leoidet.xyz/98792867862h870h.pdfIn PDF document text
    • http://idealicait.site/speed_night_3d_mod_apk9o6ya.pdfIn PDF document text
    • http://politach.com/93728675408r21o5.pdfIn PDF document text
    • http://top-agent.ru/18050912431upwnx.pdfIn PDF document text
    • http://momexatajuma.22web.org/38744387573.pdfIn PDF document text
    • http://5-euro.info/nafuzunefidt7wt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_604febd5996ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_95310fe4d5274969a84601380ffcf3ce.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_027a9c0f77ad4d2f8e8966a02adc6185.pdf?index=trueIn PDF document text
    • http://livuladebugalab.rf.gd/disgaea_dark_assembly_guide.pdfIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_f1ef759000604f9cab7349661f491203.pdf?index=trueIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_0f2771e2f2f74a90a0191b7886c57a97.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_af7976359067438b9a353345be0737b8.pdf?index=trueIn PDF document text
    • http://vetiluxakosimut.epizy.com/how_to_prove_parental_alienation_uk.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_0cd2c63d6246438398adde1cc4ee2af5.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_8b395bbb6e7e4e78813a02bf88c78907.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_ac507dd4afdd493fbd47aa2f25f58b6c.pdf?index=trueIn PDF document text
    • http://pawekixezad.epizy.com/jimimivebiwaselejiw.pdfIn PDF document text
    • http://beroseji.epizy.com/47690158391.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c5ed4fd5aee641d6af24a5c29a700ff6.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_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5220 bytes
SHA-256: 8394e484a5a494f695756c7c5cc5a72b06cda2d1093f5f732e7bd9e1a199dd0b
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 11240 bytes
SHA-256: c7b58ea9a5c7cbadf04003a087fe36e10fde0cd957a3a7659c9d13ad5aca318d