Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc23652227271dcd…

MALICIOUS

PDF

84.2 KB Created: 2021-03-13 20:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5559d261d1a6bfe82920c0b244d1b717 SHA-1: 95a2be97bbcfd494e5277e8a85c4e630ad86cbe6 SHA-256: cc23652227271dcdb4f75e250c3dcebdca7ba673067e5eef2bd4190b7012bbb7
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 0.9997

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://dafemum.ru/award?keyword=bergey+s+manual+pdf PDF link annotation
    • http://lofitner.buzz/melovo6rzq1.pdfIn PDF document text
    • https://lodufokokafapav.weebly.com/uploads/1/3/5/3/135346761/9147175.pdfIn PDF document text
    • http://fitdieta.com/woxaxudezm27l.pdfIn PDF document text
    • https://vokipokulolobu.weebly.com/uploads/1/3/4/0/134016984/3928646.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/b72cdc.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/rewizezus.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/1c6a837b.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/6604547.pdfIn PDF document text
    • http://minuette.me/can_you_make_chicken_in_a_toaster_oveno1ndd.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/bofaji-dovuf-nakuke-xojameku.pdfIn PDF document text
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/9edcc5e24e08603.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/bokanezejune.pdfIn PDF document text
    • http://watercart.ru/marvel_comics_online_appe5sfd.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/1608e6d8644d.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/sotakuzoxuf.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/sebelenugit.pdfIn PDF document text
    • https://wojamoze.weebly.com/uploads/1/3/4/4/134479738/679f7f.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://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_cfb5cc668ea74ab3a34c6c2063881868.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_71dbf1997a874f28ac2984dbc16b292c.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_a97293d1062f4992a0a7b1f271b4f054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 5156 bytes
SHA-256: 8522bac9c53caa0fba4c4314df04664d7ad3bc5f5b5383da1d8cccc12aca5cd0
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 11652 bytes
SHA-256: 0df99c081c5f7cfd1cf1c9493f6a9c9dba074dc1aa80f1dfd1ef7e74d1e78beb
font_02_sfnt_off000135bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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