Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e8716fc7f0397…

MALICIOUS

PDF

32.0 KB Created: 2020-11-08 22:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ed5914f1d1eb55ac80191a527c090556 SHA-1: bf23ce04225c8392397c8dbd5961478f802218f6 SHA-256: 991e8716fc7f03971f26a115cbd77aa6160185239dcb96c3ebf3fa307d9c5a0f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary URL found is https://traffine.ru/123?keyword=buffalo+ridge+elementary+school+colorado, which likely serves as a redirector to other malicious or SEO-abused content. The presence of numerous Weebly and WordPress hosted PDFs suggests an attempt to distribute or obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffine.ru/123?keyword=buffalo+ridge+elementary+school+colorado PDF link annotation
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/bumided.pdfIn PDF document text
    • https://jasixuruvixu.weebly.com/uploads/1/3/4/2/134234618/8838641.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/7054711.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/295e1a85b29b38d.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/xutogofilamodafof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f871bb4eb12f.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/1a4ae04e39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dusikoxi.files.wordpress.com/2020/11/ruzedetalax.pdfIn PDF document text
    • https://zawilek.files.wordpress.com/2020/11/marshall_avt50_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa1f943-0f61-4d23-8ae6-962f881ccaf5/98906267410.pdfIn PDF document text
    • https://muziwikeg.files.wordpress.com/2020/11/abdullah_calan_indir.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_off00003ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FFC 5584 bytes
SHA-256: 0a8f095130c448a232bea853b9d7793b6184827c1ad77e196c9fb4a1fb04bf3f
font_01_sfnt_off000052dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52DD 9076 bytes
SHA-256: b41317fe33b1851a63d0fe98cdb9d83f2e25cec824d1da91e5cff6a4dfeeb815

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