Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e8289e1dbfc73d…

MALICIOUS

PDF

68.8 KB Created: 2021-01-12 11:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1fe597c18808af2abc1f505e2343df4c SHA-1: a62a51fcb77b3a764b1c1aaaa444c7ce5ef2a90c SHA-256: e1e8289e1dbfc73da0c3f574525de343027b677e273f2fb3ae3a44a4b942196a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially harmful external sites. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and the 'utm_term' parameter suggests a phishing or SEO-based lure. While no scripts were explicitly extracted, the presence of external links and the overall structure strongly indicate an attempt to lead users to 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://trafffe.ru/aws?utm_term=ignou+ma+anthropology+study+material+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fd75dfa76d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f95658a45cb1.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/sudujopakabagil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fa0c197da5a5.pdfIn PDF document text
    • https://vetakowiv.weebly.com/uploads/1/3/4/7/134733886/bomesuxuxoratix_depuluvinopego.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/kosasidepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_5fbde4e8ad0f9.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/j7xgxhe/china_kung_fu_master_full_movie.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/40d91a0aa2db.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/fidalezosufex.pdfIn PDF document text
    • https://site-1168175.mozfiles.com/files/1168175/46528561831.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/begijufadi/daluvugeremipedok.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/add_cells_in_excel_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 5492 bytes
SHA-256: ce519c55efa87b6892f56ccafc72267109726479b3e6851db02c0203bf863f94
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 10900 bytes
SHA-256: d03c1f2a6c35ed23df6b75ed37aae0abf67049c412655ce0c19b3c78ec9c98ce
font_02_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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