Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c91af68f6fc250…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 09:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a9d1f54adbbeccdcfdff3da3d63c2920 SHA-1: 2032bf90667edac5fe00a885e1e3d6ed92a84930 SHA-256: 03c91af68f6fc250c4acb95c012b5230b18264032b5f14efa0e592684bc792f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

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://mezovuduw.ru/123?utm_term=mlk+quotes+the+measure+of+a+man PDF link annotation
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/4841800.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/86349108180.pdfIn PDF document text
    • http://xsale.trade/nusizarejofjbfef.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/57021293177.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/5a251919015ec61.pdfIn PDF document text
    • http://winoorama.site/sahnenin_dndakiler_incelemehj4fv.pdfIn PDF document text
    • http://vladport.ru/xavoju6lsq8.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/2918368.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/rosikalaxojapujezazelaraj2gqoy.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/2626391218m9848.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/724d348a55.pdfIn PDF document text
    • http://complect-tech.ru/1997_acura_cl_repair_manualplo5w.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/cc4cb749174.pdfIn PDF document text
    • https://kopezufotixese.weebly.com/uploads/1/3/1/1/131164020/3817213.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/wateraid_america_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/guzutekerogawapit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 1572 bytes
SHA-256: 452612010bf92904adaef4bfd0d246ec5f24367bf67eb47c7737d6475a0c45d1
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 5200 bytes
SHA-256: 46b002325ddb91f5b49b64a4d056fe792c4e946e7f42f841e82e7c31b1fc8fa3
font_02_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10312 bytes
SHA-256: 956fc5c7ca7818928add0bed6b479ebd05c755e460a264b3df3caceb3f562612

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