Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afa8aba031a704e…

MALICIOUS

PDF

82.3 KB Created: 2021-06-07 12:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6964658bd866096b1940c07bf98a8dda SHA-1: a9aff45fb8ee580ec898d15f9c5e3cc84c9bc696 SHA-256: 2afa8aba031a704e5019434bd21508bef6bd73b3215a9674a72011830fa57e24
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://oniceh.ru/pbw?utm_term=barron%2527s+ap+biology+7th+edition+pdf PDF link annotation
    • https://feromawafisoxi.weebly.com/uploads/1/3/4/5/134501851/f30b0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_606d92d1e86a6.pdfIn PDF document text
    • https://kavajosimaz.weebly.com/uploads/1/3/7/5/137500635/zoranudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5fc8500733ef5.pdfIn PDF document text
    • https://susawodaf.weebly.com/uploads/1/3/2/8/132814942/5d75ab2755b56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5ffc3128ef3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5ff0c05e5395c.pdfIn PDF document text
    • https://wonimigapikil.weebly.com/uploads/1/3/7/5/137509794/dalek-wipenuvez.pdfIn PDF document text
    • https://tofapugorod.weebly.com/uploads/1/3/4/8/134885187/328669.pdfIn PDF document text
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/d7a48dce9091f.pdfIn PDF document text
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/wilebux-firenewe-pomenojevik-guzufas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6058bf103631e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_602ebdf8947e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144504759/wasexi.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144535191/saxefogedorijib.pdfIn PDF document text
    • http://nagaxop.pbworks.com/f/82669816637.pdfIn PDF document text
    • http://zilebunod.pbworks.com/w/file/fetch/144425070/58264658547.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144462042/goxipakenet.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144499014/what_are_the_uses_of_soil_profile.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/74332497289.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/motorboating_merit_badge_book.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_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5708 bytes
SHA-256: 8ab7152c531cef54bdb017c6f7ff0b75151a2bcf0fbe54bc19c3ed8bbccd424b
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 10944 bytes
SHA-256: edb5838796a0e9301bba73f37338746e093f8e4dafbfd739944da6ba247d29dd

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