Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a182cd2c05e7f8…

MALICIOUS

PDF

66.4 KB Created: 2020-12-05 10:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5fb655ad2d36f1f8654f7417a1c123a0 SHA-1: ec456ea6c8b655dce1db43cb9e47270b4d587774 SHA-256: 49a182cd2c05e7f8c26943473cd5438a64a9c6af717d658165d34bdddeafea64
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure and others to disposable hosting, suggesting a phishing or link-farming campaign. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/123?utm_term=defend+the+house+facebook In PDF document text
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/gafaxu.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/wurokiburesoketu.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/4f07252deb18e3.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/tofusepasiminobepaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5fc05ba107a83.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/jofegekoxevamaz-lakijobajik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f901c6951039.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/7742407.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/2b09a221.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/gudukupir/brush_photoshop_for_drawing.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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 5184 bytes
SHA-256: afb7f4352fa1a2bf39eb1185b1a5416979c25d848126ab59fffbcaec263d4777
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10416 bytes
SHA-256: 184a7b79cd5cff9492877d324b64ed4a1e9ab299f6c55e2c9e2d753a10d4bf64

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