Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf7a962bc43c452…

MALICIOUS

PDF

71.3 KB Created: 2020-11-25 07:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 779fc53f7cc601a6f9271e7b93936824 SHA-1: e7dc9668e6f55faf99e4e47085a9655c8b56ebd2 SHA-256: 6bf7a962bc43c4528bf47fd6a8b4fbb13d41197aea2e49f2258258b4c4c2b108
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://trafffi.ru/strik?utm_term=fb+rogers+silverware+set PDF link annotation
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/9321062.pdfIn PDF document text
    • https://lotunepopufuro.weebly.com/uploads/1/3/4/7/134712327/9714347.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/9046126.pdfIn PDF document text
    • https://xukukotazu.weebly.com/uploads/1/3/4/6/134654047/cbc933461a28.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/jodesox.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/a96ddcee-33fe-4e9f-a1d7-724082db6349/6604594623.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/32969827109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b2dca3-81be-4629-b0af-32027e947bc4/everett_high_school_ma_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cab120-5363-4250-8701-af0cc9966bea/what_s_eating_gilbert_grape_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c8891a-71fe-48eb-966f-39c5c8c5905f/love_not_anger.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/maltese_falcon_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3861f8-44a7-42de-989d-74412d4f7f1c/8124513945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485a414f-1a50-4ed9-a709-e7346b170a8f/78681208565.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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 5100 bytes
SHA-256: 66e856ce833367ebc0afcb68679f5ecf0dbcc12cd63266783ea061ccf7ccd6ae
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 11104 bytes
SHA-256: 736d749cdd9ae42dbf28c67cb43ec88fb383883937c3a3351132dd10e5117abd

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