Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f31f63cc79050…

MALICIOUS

PDF

71.6 KB Created: 2021-01-11 10:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c5eb4459a37e1b10bcbaf821a58c4d1 SHA-1: 0630011bf7843f936725d6401f97feddf8b2d7f6 SHA-256: 451f31f63cc79050fd00574bb85568b7d2579557f95430bcaaa02c3c4dea6b9c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including a link farm, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=constitutional+scavenger+hunt+2.0 PDF link annotation
    • https://cdn.sqhk.co/guwuweri/oGihcig/easy_funny_tricky_riddles_with_answers.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/bafazi_komuruvoxat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_5fae59860c44e.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/sujumikerezagowib.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/kiwabo.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/7259215.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/bojeduvibemufe.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/jusagi/zolekufageb.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/kutabulebojutujoboz.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/martin_castille_funeral_home_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/52164818535.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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 5332 bytes
SHA-256: 165a11af5e9eb081651af9d937a6df39f3d9051917776477959b55b12d36c88e
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 11236 bytes
SHA-256: b69c712ac7e5bd418627315eaa8bc968a434c2851570cd03a98d174576e73333

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