Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cbf5f33992270c…

MALICIOUS

PDF

68.1 KB Created: 2021-03-14 07:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b0d8031d5ccacfcc960e4c96f6981ce4 SHA-1: e7b925fcd5425418f467bb5aef5e1a94ba38f8f9 SHA-256: d8cbf5f33992270c9d5a7d218464ed551f85081f6351cf14f884a4ef95b95803
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=naming+acids+worksheet+pdf PDF link annotation
    • https://tisegibak.weebly.com/uploads/1/3/1/3/131380339/xuzamewowu-nazem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_6005ba86781ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_60127c71ecd16.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/vorukozetekigapovone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fe008ceeb4d4.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/balijuromimi.pdfIn PDF document text
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/321bf837e123.pdfIn PDF document text
    • http://saxumoru.iblogger.org/56867664556.pdfIn PDF document text
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/sojegijoranatogilitu.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/bulokiketuliwi.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/8218217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_601db8fd12d76.pdfIn PDF document text
    • http://xenifizonuk.22web.org/zofabot.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/ajehd56/23115743529.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/zjgU1jb/lesagakezasojumixitu.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/luropiw/sinusitis_guidelines_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/72450698758.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/98351819347.pdfIn PDF document text
    • http://repazof.rf.gd/53323046709.pdfIn PDF document text
    • http://poduzamilikuki.rf.gd/kojurawasokekifumilifo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 5664 bytes
SHA-256: a889311225d2944bc40046fa59b866bd23eb5e368e116e433789f91583a2c800
font_01_sfnt_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 9892 bytes
SHA-256: 64e330176ca5d5013e0cfaa72b689112a86dd92eac0352a6b2026665a0e8a041

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