Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1f9618c2f3a6c8…

MALICIOUS

PDF

72.6 KB Created: 2021-06-09 03:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb5feb6ded74ed2518a5b91775679acd SHA-1: 2be44cdcc3dfe5f419572406561e835e96fd0a20 SHA-256: cf1f9618c2f3a6c8bc11bd1077298e3fcbc92793a95dfd0e2cb23ef133581cc1
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 0.9997

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://pistant.ru/pbw?utm_term=marathon+wr50m+manual PDF link annotation
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/7fb540e0694.pdfIn PDF document text
    • https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/5661363.pdfIn PDF document text
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/2638834.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/nibezimi.pdfIn PDF document text
    • https://kuwewukes.weebly.com/uploads/1/3/1/6/131636575/nexenepopet.pdfIn PDF document text
    • https://nilelaji.weebly.com/uploads/1/3/0/7/130775665/gefivodijebap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_604493612105b.pdfIn PDF document text
    • https://sobokiza.weebly.com/uploads/1/3/4/3/134363786/ef4655bee.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/gilexebuvuxufe-likojikogigeri-lofefagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_603862b0ddc85.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/lipepezaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c2a451c9a.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/65f8e98e15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_604975100d377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_602238a45484a.pdfIn PDF document text
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/mikemakakade.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/d4f7dbd0-9b82-4f62-97cb-570febff5b60/examkrackers_mcat_prep_course_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861c7173-2ded-4a38-a690-1e670e51ee20/42382002685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbafd466-0fad-47d3-afe5-6852372fc3fb/como_fazer_um_resumo_de_um_livro_abnt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17004252-6770-4e7e-97b5-4450f53f6432/how_rich_is_artemis_fowl.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5112 bytes
SHA-256: e678c95c3e0fd4c1e2cd9e750167bee5516105a38209cd52838cbb7d70382f15
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 11352 bytes
SHA-256: 878911b6a6e19e3486d5c7319889d81240d49b00cd421b6ef578600c5a8490f4

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