Malicious PDF — malware analysis report

Static analysis result for SHA-256 041f8c93f3c0dc25…

MALICIOUS

PDF

76.8 KB Created: 2021-06-04 12:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a1cdc21892ae2efa9f3cc55f62be640a SHA-1: 576b1104bbb507b9af1055345d33ccd516cd7e3c SHA-256: 041f8c93f3c0dc2591d828156b51682379b25fb73b5ad9c683ea1dc224d7e661
156 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 0.9998

Heuristics 5

  • 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.
  • 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://oniceh.ru/pbw?utm_term=ninja+foodi+grill+air+fryer+recipes+youtube PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/marurexepe.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/kiwudifenopesizotesa.pdfIn PDF document text
    • https://dofixojibol.weebly.com/uploads/1/3/0/8/130874360/0288a63a5eb96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_606c5b7a34984.pdfIn PDF document text
    • https://jonoxuxiwef.weebly.com/uploads/1/3/4/3/134314506/vowix_botufawapuler.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/3649302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_602801b0f30ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0dcb89fa-508b-473f-93b5-9c0d0372f76d/an_assembly_such_as_this_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4383b67-fa8a-48cb-9f0b-0a33417c8141/1974235165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d75eb67-d8ee-4635-9cf4-dcdd67589783/33298730576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e164a0e3-26e2-4a44-abe7-58842297c75a/tedopuzepalixewikadaxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0a043b-925d-433d-8f62-a439a5930a76/govekarezelukeluge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ccdbb8a-bd9c-42db-9f9e-9d0da16351fc/how_to_measure_organisational_effectiveness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f78e6dc-c490-4b7f-a48e-7f3b2d439438/what_is_an_excel_skills_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5b98ac-f177-4877-8578-999898c20d0a/dichotomous_key_questions_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5559265f-be45-4b0d-b47e-9b82da43e49f/uso_de_expresiones_que_jerarquizan_la_informacin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6404458e-9470-4885-9bfc-b1f5bdc24ed0/mulopuredalajodotamejem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc440c92-392d-449a-947a-9555a47933e2/parole_les_feuilles_dautomne_emportes_par_le_vent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d0a1d0-a292-480b-a7d4-06a53b820e54/hp_designjet_500_manual_service.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 5492 bytes
SHA-256: ea087176d56081214dc7feebaef38b2f758606dab15eaa27db7aab98787f0ebb
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 11400 bytes
SHA-256: 0fe06727c95804ebbae5b508b2e8e8aa186a5701f6e0a5726f4293bffa53023a
font_02_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e