Malicious PDF — malware analysis report

Static analysis result for SHA-256 e042286c3e72301b…

MALICIOUS

PDF

65.6 KB Created: 2021-02-03 06:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7eab571be97bdae663df9a2c63e206f3 SHA-1: 92107590ad94a621c0132e98f2834bd6d797a733 SHA-256: e042286c3e72301bd3c549dfbf0bde0cc6cf188b67137b63e20e6f67c141c8af
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. ClamAV and ML classifiers identified this as a malicious PDF, likely a phishing or trojan variant. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious sites.

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://crophysi.ru/123?utm_term=property+owners+association+of+lake+hayward PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc94186d78ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5ff9e6536f3a7.pdfIn PDF document text
    • http://pinegrvuig.fun/the_culture_map_audiobook_freedfz68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fe60654b355e.pdfIn PDF document text
    • http://hisgohar.site/balisiwuwetuzerasileginl6exk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_5fd79db805662.pdfIn PDF document text
    • http://dvigatel.guru/7935472235vyii3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_60031216a6916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5fca989ca6aa6.pdfIn PDF document text
    • http://dayzcommunity.info/el_exorcismo_de_emily_rose_online_latinok0ooh.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/bowifibut.pdfIn PDF document text
    • http://everydays.space/feedback_control_of_dynamic_systemsj32ei.pdfIn PDF document text
    • http://piredvizhnik.com/166095329440p508.pdfIn PDF document text
    • http://shop-kid-toys.online/kijudixemajiteleme7qh0n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fcf38cce8f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_600e00eab6fd6.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/nokujiwopog.pdfIn PDF document text
    • http://klossheff.xyz/9183042623372vn5.pdfIn PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/rugitit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 5504 bytes
SHA-256: 93fced1f8fb088eca785cb010829221012627fdedf74667054fea3bd26397ba1
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 10696 bytes
SHA-256: 22a0cc4cfd319328c17e0a630dba62d5b77a74268a92a5b07324321d20a46a74

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