Malicious PDF — malware analysis report

Static analysis result for SHA-256 2885bd0c7d43fd84…

MALICIOUS

PDF

60.9 KB Created: 2020-11-22 01:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb035fc9718863269c61a96bfd205af8 SHA-1: 284769da762ac788c70adca226c5f62d289f8b68 SHA-256: 2885bd0c7d43fd843a4f87d51c6520e3f1f7502ed2e0ac89b1049df818f9d91c
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 0.9996

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://trafftec.ru/aws?utm_term=gamer%2527+s+guide+season+2+episode+10 PDF link annotation
    • https://pomawuro.weebly.com/uploads/1/3/4/3/134368023/zosajipukawixux.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/3477401.pdfIn PDF document text
    • https://niwanokanu.weebly.com/uploads/1/3/4/5/134592400/587ce1074e9.pdfIn PDF document text
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/6679558.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/padonebozipazosoguja.pdfIn PDF document text
    • https://naxugowepuf.weebly.com/uploads/1/3/4/5/134595603/zumufobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5f925a8327375.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/giseridaxeve.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/4712850.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/1633b517-47f5-4445-ab4a-5bc42840c35e/borderlands_2_best_shield_for_axton.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/blank_dnd_character_sheet.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_off0000afc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 5636 bytes
SHA-256: 64caedba5021f496487c98691ef0f32dee70f10600cc0866b7d9fd0c00077b1f
font_01_sfnt_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 10728 bytes
SHA-256: 4e176bc4324a3f934770619743b26852beba3cca1c9424391dbfd1afadd75950

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