Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ad7087b793be8c…

MALICIOUS

PDF

81.4 KB Created: 2020-12-28 08:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c0c98dd0372f404cbfd3eff9578a397 SHA-1: 91f763c2962877b4b364e93786f6079cd96c92fd SHA-256: a7ad7087b793be8c5ade725d42964e96c195688444dbb84794cffeb314116d2e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm or phishing attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=openttd+firs+4 In PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/2c9bce2c61465d5.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/Dhjjghg/perotige.pdfIn PDF document text
    • https://bemozazowomema.weebly.com/uploads/1/3/4/6/134668792/xilinin_wovega_bujajegojifuse_nemuwewutude.pdfIn PDF document text
    • https://dexapapasogixeb.weebly.com/uploads/1/3/1/3/131384013/c44cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fa4ccbab04de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fae0089c3c8a.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/pesena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fad74dc8a866.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/lowufodavogi.pdfIn PDF document text
    • http://bundles.openttdcoop.org/firs/rIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/37309013108.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/free_brush_photoshop_cs3_smoke.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/login_template_adobe_xd.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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 4908 bytes
SHA-256: 3f144534dfe75bcc757241e7f5eed7f7bb467558b715841a350c29dac9c54b37
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 13712 bytes
SHA-256: e704d1d9e99864472a66dcad6f16ce9ab65ed10cdba4cff1d4b38e53d834683f

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