Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a1e798a532c937…

MALICIOUS

PDF

73.3 KB Created: 2021-06-10 17:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b370e6322f3500f5d6437a74c25d3b44 SHA-1: de4602a59e7a1d47d73b08c9c20cc53a7ab78109 SHA-256: a1a1e798a532c93770bec2beab028a34df351abca5e933d87b36e6570d6145f9
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 by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://irlanc.ru/pbw?utm_term=among+us+game+free+to+play+no+download', indicates a lure related to a popular game, likely to entice clicks towards a phishing or malware distribution page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=among+us+game+free+to+play+no+download PDF link annotation
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/jekago.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/zilabudufov.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/7561757.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/videwazowa.pdfIn PDF document text
    • https://vatanivirasuta.weebly.com/uploads/1/3/5/3/135387760/zifitojulonefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_605501cbdf9ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe029f2aad3f.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/piwabukaxinowozig.pdfIn PDF document text
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/f9e3ebb25843.pdfIn PDF document text
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/xexuj-lupuwifefa.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/8240831.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/b9ad37d97.pdfIn PDF document text
    • https://sazetikegiwujo.weebly.com/uploads/1/3/4/8/134895432/433c0defe6cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489975/normal_601b3d5495b8a.pdfIn PDF document text
    • https://noxatedigijo.weebly.com/uploads/1/3/4/6/134660841/9203619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopidix.pbworks.com/w/file/fetch/144622050/how_to_fit_zoggs_ear_plugs.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/f/99521859296.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/f/jupaxoviwegivatojoji.pdfIn PDF document text
    • http://tugewuvog.pbworks.com/f/danolujiwutiwidigakise.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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5544 bytes
SHA-256: eb9911afaa034cc865a931f6f261fd3adfcff59f1b9d224a67a821a9345c61bd
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 10080 bytes
SHA-256: 20c66204e40c96b480af01f70634ca8e028fae1ca7767c6435d9c171fb211af5

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