Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb24388ffdc11cf…

MALICIOUS

PDF

69.6 KB Created: 2020-12-27 18:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 869ffa1a5a0d6f101168ffcf5c7933ec SHA-1: 152e7a8daa31454f89138dffff9a4e71130feb0c SHA-256: 6eb24388ffdc11cf11cfbd0655c7d5c26957aacc52e82bd426df54260c538f49
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Dc tour guide jobs', indicating a lure to attract victims. The presence of PDF_ACROFORM_BUTTON and PDF_URI heuristics further supports the malicious intent of redirecting users through embedded actions and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://trafftec.ru/123?utm_term=dc+tour+guide+jobs PDF link annotation
    • https://cdn.sqhk.co/sirejeforox/ihAnjgq/cafe_racer_off_road.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/1316622.pdfIn PDF document text
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/21a559862b.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/xagibemoja_wimojilotodin_vitaruwetonek.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/zirer.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/ihmZBgj/baxunafin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f87a8ca31f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fe60b5948553.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/e96725878976b5.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/zuvovoxigumuz/ragomiso.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/magigupokabutivafuma.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/nesigumegixi.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 5080 bytes
SHA-256: 8199f4294175714a8fa7dc44f31086fc34cdbbce16e57398a2462c0f6f59ed76
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 10528 bytes
SHA-256: bf1bc3bf2e37be700bd5fb780c6ce2470ad414e8e5b39f6118c814ca34290443

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