Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7fe9170d026cd…

MALICIOUS

PDF

67.1 KB Created: 2021-01-17 12:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30e9b7203d313229b84c71eabedbfd2f SHA-1: eeae101d6619aa46d4e36ef4be0efb63a09dd969 SHA-256: 43a7fe9170d026cd9f3fd179e9a89014aa7cc19b92854e8537a7ddbf400dd872
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics as a malicious redirector and a link farm, indicating its purpose is to lead users to potentially harmful external sites. The presence of numerous links, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=engineering+materials+definition In PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/ponub.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/5873015.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/Rgfhigg/43481788833.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/newigopogikimapared.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/xexasudizoraruwiwim.pdfIn PDF document text
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/7176291.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/hbSGoha/kevakidoniwofikagiter.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/daf32f49db882f.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/nuxotemop_dawizunatepa_vexuzivejor.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/927a16d7dcd5eab.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/xutomoxu/character_certificate_letter_format.pdfIn PDF document text
    • http://purubonosarule.rf.gd/6630932778.pdfIn PDF document text
    • http://tolimimagag.epizy.com/canons_of_taxation_by_adam_smith.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_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 5184 bytes
SHA-256: cf522c956b5e2d34d77e82a4cb557c005d654728cad99d6af4c83ceba7210c18
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10712 bytes
SHA-256: ba1693fef2b4661291b5b785e50f32811eb2ab3351e8bfecdaae26319a3c5682

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