Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cb518f708c83bd…

MALICIOUS

PDF

97.5 KB Created: 2021-02-21 04:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dfa4c9d6efee1f3b8f0209154f77eab0 SHA-1: 3b6920252a6e8ed63f63216ed723489a499c07fc SHA-256: a1cb518f708c83bd13b8494fef2b1c3e13648171ef760a1ed8f4a1fdd60ece65
126 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or low-reputation platforms. This behavior is characteristic of a link farm designed to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 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://bologen.ru/wix?keyword=dbpower+9.5+portable+dvd+player+manual PDF link annotation
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/0b2d403a.pdfIn PDF document text
    • http://fineagencyy.com/kodeviwi4ik0s.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/impossible_quiz_1_number_42_answer.pdfIn PDF document text
    • http://xtrading.buzz/formica_countertops_wood_lookqxxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_60306b137fb7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fdef5cf1441d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fc8c0c5bede3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_60318eadd6e2f.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/525ca10c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sexesivakolek.rf.gd/best_cotton_poly_blend_sheets.pdfIn PDF document text
    • http://pezusor.epizy.com/22602312075.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 2952 bytes
SHA-256: 013fc9f45313cdddd5762e6694753e55f6a85ad2eec225b6e17fd140af1ee5c7
font_01_sfnt_off00013947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13947 5632 bytes
SHA-256: 691dcc864105f13ea64df99ee519869c4623836c45db1aa6b73038539980df22
font_02_sfnt_off00014c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7C 13704 bytes
SHA-256: 0555226ea02a77a65cd62cd72fcbd272f6f85d2ff294c1e6e30bab438e3658bd

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