Malicious PDF — malware analysis report

Static analysis result for SHA-256 da11a71a48f4fab9…

MALICIOUS

PDF

69.0 KB Created: 2021-05-06 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd9f8d83882db5dff4f424b98ed7d4a6 SHA-1: 19ab1908b1c46739544f10454980a7b36b6b507e SHA-256: da11a71a48f4fab9792ba240ef6fed806e4957c4f7308766231f2605ce19d58c
186 Risk Score

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-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.
  • 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=who+moved+my+cheese+download+video PDF link annotation
    • https://xogegexisupu.weebly.com/uploads/1/3/4/3/134319275/gixakofikuv.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/09ee202771d.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/3ad171.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/c0ab86ab8a2a.pdfIn PDF document text
    • http://xogubafirugufa.iblogger.org/consumer_reports_dishwasher_brands.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/xuxupizevobuju.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/pulokopefipufapokoma.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/wametezono.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/5324503.pdfIn PDF document text
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/2658011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/91097813283.pdfIn PDF document text
    • http://pokowowusi.rf.gd/zufazoguj.pdfIn PDF document text
    • http://woxanegerofokox.rf.gd/66627476630.pdfIn PDF document text
    • http://koxowideza.epizy.com/badanatetowefulujebudul.pdfIn PDF document text
    • http://ratezomi.epizy.com/adding_algebraic_fractions_worksheet.pdfIn PDF document text
    • http://jesuwipefeg.rf.gd/67909410888.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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 5352 bytes
SHA-256: a451aecc2ada67b3e633d6018819ab97bd7f34306dfbd3e8eec6cf4bfccf42a3
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 10312 bytes
SHA-256: 39d10247fbc99477c6bd97c52694bb4707054e6b76215e9f7ff84b0a5fe51d50

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