Malicious PDF — malware analysis report

Static analysis result for SHA-256 151cc7a3338e0295…

MALICIOUS

PDF

64.8 KB Created: 2020-11-25 11:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9a7b29efceb012c304b95e8ce02de21b SHA-1: edba950e35251fdfc86864452bac00c0c6bb4d81 SHA-256: 151cc7a3338e02957fc78838f3bccfc12f0867ddb3d130979a8765aaabe3599a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to create a link farm pointing to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=lil+peep+face+tattoos+temporary In PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/63587ab4dff3.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/gotitibekovi/34723412283.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/definicion_de_metaparadigma.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/lulegobibewo.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/fnma_guidelines_on_texas_cash_out.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/80298662261.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/nuviwalegaseratigutet.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/9214123411.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/job_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/bushnell_sport_850_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cc697b-5211-4d35-abe5-4924edfdf30c/chemical_engineering_projects_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/xaguli.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/sentry_safe_lock_box_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/coliformes_totais_em_gua.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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 5204 bytes
SHA-256: 8d6e021a655c695ef111011345eaac01493deeaf7e6634786bc4c16b934292fe
font_01_sfnt_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 11360 bytes
SHA-256: 8c07f3afd603c64882e8960e47b07103ab85e201293d925049b1aaf5a80d3fac

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