Malicious PDF — malware analysis report

Static analysis result for SHA-256 2655267b6a39183a…

MALICIOUS

PDF

66.2 KB Created: 2021-01-02 11:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3a1f18a080f2f7f38a6e1a08914e1b88 SHA-1: 8c4f16d1c579879fa747caaa15f48f736e2fedc9 SHA-256: 2655267b6a39183a071545630fbddbf46072fe50f69193f5bbefbab68cff8dd4
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=weather+report+khanna+city PDF link annotation
    • https://diwefiramogepot.weebly.com/uploads/1/3/4/2/134265367/nidovakume_vekaredo_xofar_nabakemovu.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/gexog_giluwifobobogom_sobalifew_folokotozawo.pdfIn PDF document text
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/legub_banim_xipapinuj_fogegobisido.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/lotodulawogowa.pdfIn PDF document text
    • https://niresofitize.weebly.com/uploads/1/3/4/5/134576450/50946b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fa2196a13ee1.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/7586083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5fe00e8de6e94.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/8fd11da9ddc9.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/fenivadajabev.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/8687248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/639fd11e-abab-4a0e-b7a9-030e203626f7/6538648487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1af0814-3b04-464e-842a-9de3e29878ec/evening_dress_patterns_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e161c02b-9c00-450c-8667-e6e9b0256132/rene_descartes_geometria_analitica.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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 4988 bytes
SHA-256: 32105b899b2043a2ced94010ac9024317b6057a9bb97094935e969acd83b1b77
font_01_sfnt_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 10616 bytes
SHA-256: ee8a329d0b5ea0a37a22a038e2a1edd19b98aa4156ccf39b284eae2ec05292b7

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