Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fed4a2bcb7515f5…

MALICIOUS

PDF

89.1 KB Created: 2021-03-15 20:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb1053e58633c4125c024144a9277700 SHA-1: 9f79470bc8111b1b2b5bfcddd3b6d49105823cfe SHA-256: 1fed4a2bcb7515f536fbb8f4484767da602c5abc7190e01c7d6b66f5b5df1eff
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=k+bhagyaraj+songs+free PDF link annotation
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/2926477.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/3ihgjJt/nebusidaxilebuvisozavipa.pdfIn PDF document text
    • https://fofodivadi.weebly.com/uploads/1/3/4/8/134895081/c9f36e9c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hh8ifge/lonezubakavuvawoge.pdfIn PDF document text
    • https://betijefozivur.weebly.com/uploads/1/3/0/7/130776077/10755e113c.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/ejbhgja/magic_tiles_3_game_free_download.pdfIn PDF document text
    • http://interbankdigital.com/jojinadufafikoj33lq.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/kutsWih/1800323840.pdfIn PDF document text
    • http://lassituda.online/1363510821929tpk.pdfIn PDF document text
    • http://letgtma.bid/what_causes_weight_gain_after_gastric_sleeve6cr93.pdfIn PDF document text
    • http://noverst.xyz/apple_pie_apk_meaningsk947.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/lidemupafumewe_zatavirazod_xowelireguj.pdfIn PDF document text
    • http://mosquito.codes/sopoxodotojisetidovubenul8r.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/96f97d3f-2fcd-4aba-bd57-570a00db0d92/30049883301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ccc71d-efc6-47a7-a6f1-a31e629d2523/duwukawuxenunelajus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce56631-5ad8-47e7-badc-1f6bdc0f0725/kogusonakosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7040ed61-378d-41a4-8f4f-464422a67d7d/falanexozavejalewiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25b4460-9f3e-4461-a09c-7350344da940/5949103735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7defe6ec-0619-45cc-a8f9-9d3accdfae16/how_much_to_rebuild_nv4500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a12625-4887-4599-8909-db60409810e7/47950443082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773a6314-f41a-4ed0-9fca-23509db6f519/python_dict_get_value_to_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a294562-40b7-4fbd-bb2e-5fef0be71fb2/modunaseripomige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539c19b6-7cea-4743-8aa4-90d5dd708043/what_is_the_impact_of_nonviolent_communication_in_society.pdfIn 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_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 5284 bytes
SHA-256: b82bf20a72b78017411e3f0f81c644630bacfea7ddd0b32c3fffc655161ef572
font_01_sfnt_off0001312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 11140 bytes
SHA-256: 8b51d0a52400318a769a6fc58bdf87ad3074f91ee4f9c0a30c1be6a550762e81