Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4be4b38e724aa2…

MALICIOUS

PDF

74.7 KB Created: 2020-11-23 14:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b9e70d0a1e6cdb1ecf658c7218a247 SHA-1: d44680e63f9be418e8fa2b5c2355aa19aa837aa5 SHA-256: 0d4be4b38e724aa2f26faf74cb984555d4487d67d97a02eb609185c499526c8b
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=hello+kitty+sewing+machine+manual
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/4b2a0562551fd5.pdf
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/ponagixumagofogomemi.pdf
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/7460340.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/64d3b7d32d8a1e0.pdf
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/fakemozu-wevebamaj-potimox-remosag.pdf
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/f3863fc95c.pdf
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/tikivewonij-kenilum-modidaditagadeb.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f890947ceaac.pdf
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f92c6e090ee8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeduzizonox/26170763002.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin
1298a3a96f569dc136b27ef0bde3641e6fc34ceb54bab169fd56d73a8801691d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5336 bytes
font_01_sfnt_off0000fba9.bin
ce754b953b9a90e08c361349ff3691c2e8a00211415f3187701202e621926513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 10360 bytes

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