Malicious PDF — malware analysis report

Static analysis result for SHA-256 5846c9dd2c97af15…

MALICIOUS

PDF

68.8 KB Created: 2020-11-11 17:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e4f33615873ac97f62e8ff181d12955 SHA-1: d852d55315127c59dc83cb9daaa10f66d275f592 SHA-256: 5846c9dd2c97af15d5e6834a9191928678c3ba3897c69b61fe0416d262fca657
156 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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=chess+game++please PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f87a4e3b148b.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/dibal_kejiguxed_juwuzut_degarif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_5f90529a67619.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/jubew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fa0ce9d7a084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f96fa33f0bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5f9812cd20987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8cb241b8ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f9843eb284b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f94c7f4263e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5f97732752965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f9099eaa1188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5f99c2ecbcc9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/parefova.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/5437980507.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/roper_dryer_parts_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/88872547493.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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 5044 bytes
SHA-256: bb32f95ac144b6932cc42bfe091b6904abada1af814e0a274c129727d5af7ccb
font_01_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 10676 bytes
SHA-256: d4af3540f811c19f3282d06e3593354e8e32d276144065f2c9ae9371f24b6561

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