Malicious PDF — malware analysis report

Static analysis result for SHA-256 10286cbcc472f423…

MALICIOUS

PDF

65.4 KB Created: 2020-11-20 13:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c5fb795bbf486ce4ea30655ca533102e SHA-1: 2aa3cd32c1f56ea083ccac0b6a77cddd5bf5ed3b SHA-256: 10286cbcc472f423b2afcfad847c32b9b4ea4f7daaa399bb6dd48655432c2752
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. This behavior is indicative of a link farm used to distribute malware or conduct phishing attacks. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://cctraff.ru/123?utm_term=blackwell+companion+to+epistemology+pdf In PDF document text
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/0c1dd739f9f0.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/1a95067115.pdfIn PDF document text
    • https://sexetolekik.weebly.com/uploads/1/3/4/6/134632248/fuxaviderin.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/jiwama-gumadeger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5f935d3c67ee4.pdfIn PDF document text
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/2516246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5f9eb036b0eb6.pdfIn PDF document text
    • https://wojowoseda.weebly.com/uploads/1/3/4/2/134266381/90bed4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1553a8-5936-42a0-96a9-3721ac4f6182/fuxujagibibulenelewu.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/lg_accolade_vx5600_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/22113724767.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/washington_dc_field_trip_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d5c61c-a153-46a7-99ba-cc666b250c0e/6558558628.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_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 5688 bytes
SHA-256: 27b278fc788447749a12fb117eed34e55a023369c71d4c2183d53ceac81e4762
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10392 bytes
SHA-256: 0623426f3e45bbda7501057784c0b0479b1cac3adb49fd9c4622dee8acebc447

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