Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb1fefb24148013…

MALICIOUS

PDF

69.7 KB Created: 2020-12-14 22:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d35a5a3c04ce0fb0e509017b175d68eb SHA-1: c19be037cf28dc46b565ad5a7dae46a173c1a3f6 SHA-256: cbb1fefb24148013edd7745b3aca12e5fb04bd2b939a4b65de7be3e9c3cd698a
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=some+of+my+best+friends+are+books In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f8c54bef2247.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/sadabixezad.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/fizurimub.pdfIn PDF document text
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/ziwatokafozaz-xujibubabuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fc98ec8964fa.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/6266754.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/afe3c063-fb31-4090-a323-c9b369b2e79a/66603560849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e30190-f44a-4a54-b952-e8ecdbf83f92/j_cole_for_your_eyez_only_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6a66cf-ba8f-4275-9188-0c9676cf0cdf/ffxiv_hunting_log.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfc8439-c5d4-4b9d-aebd-a769e661557c/50_sombras_de_gray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53509e3-fbbb-4ec7-a2aa-8a1f744e6f46/879161784.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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 5428 bytes
SHA-256: 4e8b16d79029161b328280f5a33938b5e9efbade441db9ef63416841e1a12152
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10348 bytes
SHA-256: 7f37ab2b151eb5f979d55838c37bf742767334bfeaf4b65947e5cc0b62f119db

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