Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dcbbbed9814d9b…

MALICIOUS

PDF

89.0 KB Created: 2021-05-25 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b622a9a9f39e3c9e1a27f2b2460eaad SHA-1: 51100d4e061e3eb14ae963de093e664829dba8d0 SHA-256: 95dcbbbed9814d9b8bdbf3bd015e53f83fa8e8dace4f039817f72c534d8083ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains or are part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan. The embedded URLs suggest an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=are+sezane+clothes+true+to+size
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5fda017a2b905.pdf
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60112c7d7bd6b.pdf
    • https://dopeziporop.weebly.com/uploads/1/3/0/7/130739225/7595172.pdf
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5feb4de3c52b8.pdf
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/bojogop_bumoxutoj.pdf
    • https://cdn-cms.f-static.net/uploads/4470825/normal_6026589f7eca8.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_601722d466ff1.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_60244269a0ebb.pdf
    • https://static.s123-cdn-static.com/uploads/4446166/normal_60016a0e8d8e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pokixovuxik/4094833312.pdf
    • https://s3.amazonaws.com/zebarufuridorur/hard_phrases_to_guess_in_hangman.pdf
    • https://s3.amazonaws.com/lokijuronig/kitaginijubovawisa.pdf
    • https://s3.amazonaws.com/jevopemosod/cyberpunk_2077_mods_unavailable.pdf
    • https://uploads.strikinglycdn.com/files/557cef3f-732d-43cc-998e-6d07642e8e7e/is_liftmaster_compatible_with_chamberlain.pdf
    • https://s3.amazonaws.com/sorapobuk/what_is_the_atomic_mass_tell_you.pdf
    • https://uploads.strikinglycdn.com/files/b8d34a89-a511-4f5b-a792-a15d79d4053f/varidokoxipudipozez.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/how_much_does_it_pay_to_be_a_graphic_designer.pdf
    • https://uploads.strikinglycdn.com/files/a573cce0-003b-421d-9ba2-6333b2bf62b4/college_trigonometry_final_exam_review_with_answers.pdf
    • https://s3.amazonaws.com/sitok/25110366446.pdf
    • https://s3.amazonaws.com/bomifabipi/jawinezes.pdf
    • https://s3.amazonaws.com/dudujopixejikug/40726803727.pdf
    • https://uploads.strikinglycdn.com/files/b95d3b42-6ed9-4991-9eaf-82b9ebfbcc56/66459685007.pdf
    • https://uploads.strikinglycdn.com/files/945e96a7-21ab-4510-8fd1-56729437f4ea/bolalepupi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f93.bin
91d40057cbd58abb6aa478b4108273396d5802b4dfd9fee0d6daa8de435baa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 4808 bytes
font_01_sfnt_off00011fdb.bin
5dc0e53062c6530d57adaef9ed04c0890e92f66340a9d1f90862110b0ea1947e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 11500 bytes
font_02_sfnt_off000146c4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 4324 bytes