Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e7e1d1078ae0ce…

MALICIOUS

PDF

82.6 KB Created: 2021-05-16 19:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad062a1d6a662b9f2bdb932b4f5297db SHA-1: 84aabed14308ed5ee0b78a5d78baed12e89a7632 SHA-256: 93e7e1d1078ae0ced6153b1e1fcdd04c64cec4e5148e6d2acbef0a78546b1a97
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://pelibifir.ru/strik?utm_term=ap+calculus+bc+textbook+online PDF link annotation
    • https://xazalonabi.weebly.com/uploads/1/3/6/0/136086847/gekafujipusazofi.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/cash_flow_management_strategies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_6058c51f2925b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_602b12d3031c4.pdfIn PDF document text
    • https://tonulaluxi.weebly.com/uploads/1/3/4/0/134099082/0a4bc1ec7.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/wazezeluw-kuwesif-duxeviwodijivep.pdfIn PDF document text
    • https://zexonozanefamiw.weebly.com/uploads/1/3/1/1/131163740/durilexawukopesuj.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/684b5082cc6c0f1.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/mataxudiropofuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_601e61c2c9ef2.pdfIn PDF document text
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/misujexobodofe.pdfIn PDF document text
    • https://pugojowu.weebly.com/uploads/1/3/4/3/134334477/5014414.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/b972c763-f5b7-45a8-96a6-72dd3d1e2b34/11473460480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04715c1-3937-4c6e-a767-9a46a7866b4b/simpson_pressure_washer_3000_psi_2.4_gpm.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/kegezilunofofaxarazaw.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_b3376245ac524970a80472f63b9e9d01.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_018de8bf293147e58bad0442c1ec4de0.pdf?index=trueIn 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_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 5092 bytes
SHA-256: 27f0903a2e193abf2737c2bca44abbea3a157117d7b18cd886f9c8dd22c7672a
font_01_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 11368 bytes
SHA-256: 2f9184c1669d3d3028f6f6a17d816a79c705ee85362309fda52d935119a8d0b0

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