Malicious PDF — malware analysis report

Static analysis result for SHA-256 901183544d175128…

MALICIOUS

PDF

63.1 KB Created: 2021-01-04 08:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 205d2797cd505285a12f7243fef12547 SHA-1: e91e874151a5c0900916d26ec1738764aabf0bae SHA-256: 901183544d175128b4732b78f68df7ce1158777d09658939907a42b60c67fca0
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The document's content appears to be a lure, possibly related to 'integrated science cycles worksheet answers', to entice users to click these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=integrated+science+cycles+worksheet+answers In PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/liwafamu-gamufenexuda-fetunifidigezar.pdfIn PDF document text
    • https://tadozowilafozu.weebly.com/uploads/1/3/4/7/134710515/3c0a8.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/heVXmii/gozixeburetolizixana.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/mijopitikolede-guxovawezu-bexabamamigew-wozav.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/dutes-xavaj-mopufepamoxob.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/AcNhjpW/vibesaxetobasubeg.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/rovolevivaposo_luwarevumuxizu.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/nasibexuti.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/2281844.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/nowokil/design_patterns_in_c_metsker.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/maintenance_website_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92531f21-8db7-48c7-a7e7-64b4d7179d8f/piwifomuwunakezowijuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17b23d4-6eea-4301-9e85-3955e137df70/67306410661.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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 5396 bytes
SHA-256: a0dd3f21bc3859b1810f6d1de9deaf11c1f13717274c4fde29dae9eec1f25163
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 10340 bytes
SHA-256: 8bae8c853beecc8e4a4f2fd95962b53aea8c84b29659907dcbf6b37ba0d1bf3c

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