Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd8cf5979fb263…

MALICIOUS

PDF

95.9 KB Created: 2021-03-21 21:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1d4089ae68b4e5244dee10db9dc70787 SHA-1: 93b09b983ccaf1f412bd93742c6650b70a348982 SHA-256: bfbd8cf5979fb263ca7dd31bd40dd11fb4ff6360b61aaac0729a798530b2a4e7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or phishing attempt. The primary malicious URL identified is https://bologen.ru/wix?keyword=sandy+cheeks+voice. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=sandy+cheeks+voice PDF link annotation
    • https://cdn.sqhk.co/nefakovuwot/KEgfJQy/racing_wheels_for_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/bIqbifQ/free_60_s_70_s_music_downloads.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/YWx9jee/lagawomuzuwodekowowo.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/WBBhf33/halloween_party_invitation_wording_byob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_6031697ebe46e.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/8ae69e85e6c.pdfIn PDF document text
    • https://jipafevumo.weebly.com/uploads/1/3/1/6/131636956/pamewopevok-sodunidapijo-nilalalavanuje.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/8319862.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/jevoxuladabibusogewe.pdfIn PDF document text
    • https://malibuvebejonab.weebly.com/uploads/1/3/4/5/134524684/6444400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_60059aa10597f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_60531c6e2442d.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/34a417e4-043e-46ff-aee4-7fb2576b050d/lenovo_t430_replacement_battery_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/line_6_bass_pod_pro_rack_mount.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_37b7d4eb47e04c9d896065a637e1a52d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcd2921-04c0-45d4-99d0-96db89561ecb/15190421559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b60772a-c80a-4ab8-a3c2-1202577d0175/5_love_languages_quiz_free_goodnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b9147d-8bb4-4709-8d48-4f99a02d9612/python_machine_learning_a_guide_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/woolworths_slab_cake_order_form.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/how_to_build_time_capsule_subnautica.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_f2c1507002764aa6a5ef7cd7f243f12b.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_off00013a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A63 5228 bytes
SHA-256: 8c52223575968acec7d6f7f2fc16c67cd9eb3f2ec522c87ed3a1576f657ff4e0
font_01_sfnt_off00014c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C38 11296 bytes
SHA-256: 7659796ac8abc42ccdc9ecb86b00f9f2853b22d01be222318d2afcd1f0768f76