Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f6d92b8b256c2a…

MALICIOUS

PDF

69.3 KB Created: 2021-06-01 10:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 522c05b1379da450aefda48b3b783e9f SHA-1: c56c025362533fa2dea633bbd3515410e1d48391 SHA-256: b0f6d92b8b256c2ad5b28fec18b1ab774b0e786e3f97a39b94c47f44e9b1a1e9
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 0.9998

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://allytemp.ru/pbw?utm_term=baofeng+uv-9r+plus+manual+pdf PDF link annotation
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/rozenek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fe20c7161c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_6054b9ca8b179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_6056c139b103d.pdfIn PDF document text
    • https://rilubaka.weebly.com/uploads/1/3/5/3/135303332/2848466.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/piriviwibojad_tutidi.pdfIn PDF document text
    • https://ralakugifobiw.weebly.com/uploads/1/3/4/5/134589758/1795094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6062af5c69a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_60135c2bc656c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600df72903f37.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4453532/normal_60b551a3b6b5b.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/nuxuterimon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5fefa25fd53fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60184f29e575d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ff025fc905ce.pdfIn PDF document text
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/7f6d01b.pdfIn PDF document text
    • https://mibimosa.weebly.com/uploads/1/3/5/9/135959727/92ce61d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotikeralo.pbworks.com/f/96627985039.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144452769/advanced_oll_algorithms.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144450954/dafeguzusit.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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 5660 bytes
SHA-256: 23496f4c114635afc177b98aab10dc80ec39b66a394cfe42df0d4b7edc8e2722
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 11268 bytes
SHA-256: fab71c56a07f809956eb37a5aa72d8112b2b8e94af9ba4dce105a31753c3a522

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