Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bac050ef248d32…

MALICIOUS

PDF

131.2 KB Created: 2021-01-23 15:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: baf02fff5b85fac790a2d9691232e69a SHA-1: 1be17885c382b36d96cbdc4bc9b67614ca0ff476 SHA-256: 15bac050ef248d32ee4d4e3e2b5b7a8e6c469f67e0bf46f1d624306d43524e28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of external links, suggesting it is part of a link farm. One of the primary URLs points to a domain associated with potentially malicious activity. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/aws?utm_term=guidelines+catheter+related+bloodstream+infections PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5ffeb582bb81f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff2a416eef12.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/dogeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5fd97046dd528.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/9311008.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/5c64493c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5ff05d892d07b.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/rotugivi.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/doponipuz.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jfEzjjA/nubiguvajesafaregadobiru.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/TOhdigH/fantasy_premier_league_gameweek_31_captain_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/jPihih2/32738858279.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/1749954.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/2036957.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/rikolesafuwofar/59105678888.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/avision_av176u_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/63008870231.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/jabber_login_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/mofapuxitowalalanudub.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_off0001c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C259 5432 bytes
SHA-256: d27c2157dfd1682dd835de729cee480478c5afcc4002af0ddb0f4ae0966c5ccd
font_01_sfnt_off0001d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4A4 12992 bytes
SHA-256: 49f78fa595f0735a1e05759b5fe48f0a7926a9d5a58c955e977f50d919b475bd

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