Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb920a25d5cf0ac…

MALICIOUS

PDF

75.2 KB Created: 2021-05-20 10:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff0fc990b13b3cbc0b1f085552476596 SHA-1: 9b6dbb9610e291fa750234da21ebc899ccea582c SHA-256: bcb920a25d5cf0acb2a9ef7c3be4ba47b06ecee5b3b514d30e845f38b176bf20
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-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://bologen.ru/strik?utm_term=pioneer+vsx-44+manual PDF link annotation
    • https://pafukonogoxaxe.weebly.com/uploads/1/3/1/4/131437157/1ff5f70f4df14e.pdfIn PDF document text
    • https://xujesosa.weebly.com/uploads/1/3/6/0/136090165/8774892.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/cbcf41e.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/7526643.pdfIn PDF document text
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/rasebigozupejaduza.pdfIn PDF document text
    • https://fojinotumure.weebly.com/uploads/1/3/0/8/130874368/eb1fe4a1.pdfIn PDF document text
    • https://guvufusefek.weebly.com/uploads/1/3/1/0/131070011/nazowisiwedibub.pdfIn PDF document text
    • https://duzesoduvumasu.weebly.com/uploads/1/3/4/1/134131570/gadefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_605df8797e3ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5ffcd6c6323ad.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/6ce89965-5395-4344-9a6d-16d30fdaf02f/87582915929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc0f5a-db64-4dae-809f-834ffe02d002/61836568939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be931a0a-6349-4215-864a-c9f3d78697a4/tidixexixipirimuziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae8f01b-c164-4087-9666-d1395ce42c40/how_much_do_social_workers_get_paid_a_year_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/55886519080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5261a7e3-914e-46b0-a54e-00ffc5965387/94095292626.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/what_does_calorie_mean_in_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff5afa2-baeb-40d9-8498-ab98c85f7e2c/motizozibakugipusolidose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5325072f-7913-4ba6-8123-05e2e8db1ff7/oxford_english_dictionary_meaning_of_apple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9577f0-fc8a-4476-ade1-ee19d8dc968f/mafajafizuwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5375e608-f82f-4378-8a48-315c39e35975/76521690212.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 2828 bytes
SHA-256: 2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 4880 bytes
SHA-256: a58805adba58e8b62c244ae5aa51d4f2a7b7165490dd32fd41e8e2e13f41e752
font_02_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10260 bytes
SHA-256: b519e5c6612bd4b1805936f5d7a93135f773ad89f6954a2185acea1db753c508
font_03_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34