Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd039cd80167fe20…

MALICIOUS

PDF

88.6 KB Created: 2021-02-20 03:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 67b52ed0136aaca791dfb6c098670ed2 SHA-1: d7e79b5eb3a2bc20dc7f20512b7d600161972696 SHA-256: fd039cd80167fe20cac07906f927a69c041030861d2e0cc988e8552ba2e9365a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDFs hosted on various disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=skyrim+vr+mcm+not+working In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_601fbbcd07cfe.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/mifilazixe-zimizuxile-kifesaxedoxak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5ff32c4052ce0.pdfIn PDF document text
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/3ef42f518064cec.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/d6bd5045370.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/c774c3ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd353a0b4772.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/OMggdhc/nemezopaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_600bd1a596f73.pdfIn PDF document text
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/2245603.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/6fLichi/wallpaper_tumblr_hd_flower_garden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_60303f3b4cb41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26e9e4274a.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/cghqLgj/nonidoxobuxewef.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/dazunapemad-dikevinuzasuw-fabezomuzefal-titewen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff6584070437.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/samopakamefap/protein_synthesis_transcription_and_translation_answers.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_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 5120 bytes
SHA-256: 37982186d9da14970aafc6c8f8f7023508bfa22b3b2501baf2f5c48b07fff2d4
font_01_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 11072 bytes
SHA-256: b499e98d9790f500b104654f6f76f317f9e519c561111af9c28f6ffddc196d1c

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