Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b6b98af6900bb…

MALICIOUS

PDF

75.1 KB Created: 2021-01-18 13:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d0a2bb21c5f3919fa9707037a2b3afee SHA-1: 6512b19982cc3d709cacce5d74fd72b055e7fe67 SHA-256: 951b6b98af6900bbea07b77944f7f3cff0c4a623735d5c15d95b82b95bb9373b
244 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL that appears to be a lure for downloading an executor. The document also contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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
  • 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=tomty+gaming+executor+v1.6+download+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8fe24f7b5a6.pdfIn PDF document text
    • https://cdn.sqhk.co/varaxupumami/iSihjaq/58628574659.pdfIn PDF document text
    • https://site-1178760.mozfiles.com/files/1178760/mazojiluxixolulubozega.pdfIn PDF document text
    • https://site-1252315.mozfiles.com/files/1252315/biology_book_4_apk.pdfIn PDF document text
    • https://site-1247112.mozfiles.com/files/1247112/galvanised_corrugated_roofing_sheet_sheffield.pdfIn PDF document text
    • https://dexidete.weebly.com/uploads/1/3/5/3/135394420/4557728.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/hcYjgyQ/ninukinefinisetoxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f88d954a8399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f8a693de59b1.pdfIn PDF document text
    • https://site-1174448.mozfiles.com/files/1174448/84363843817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5fa5c28e02ccc.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/tixedujegibex/37958658373.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/63918531713.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/26217385391.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/karovisizesu.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5672 bytes
SHA-256: ea26080b99c6dcac69c40f954f359e8a826c107bd8c58a6b3e6fa73582e5a489
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 11932 bytes
SHA-256: aee9f6d47613af8688284524f516a642e4c39bcc2959a5bfd7a930be42024504

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