Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403f0e5841c850b…

MALICIOUS

PDF

71.7 KB Created: 2020-11-23 21:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f18c3a68d7f301e09bec659776032e0 SHA-1: 26f77232ae7c0d2dd13e655381f8addec0f394ea SHA-256: c403f0e5841c850b5d2a4286ebaf9194432ec1687a1d0e1e1a046f28d4562b2c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffset.ru/strik?utm_term=the+spiritual+exercises+pdf PDF link annotation
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/9458294.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/259b57681d78.pdfIn PDF document text
    • https://bojididiz.weebly.com/uploads/1/3/4/4/134493327/6978124.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/eaccb7992dd.pdfIn PDF document text
    • https://majujeleku.weebly.com/uploads/1/3/4/5/134590665/zosim.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/024ad331-f914-42a4-8484-b284abc246f4/31366680563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a56c97-5cd1-4bed-b419-0a308fd767e3/14303337981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca4ed2d-edd5-4e9d-8528-b188719eed63/youtube_christmas_vacation_-_movie_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0341e582-5d54-4d2d-9119-cb954db06c1f/lojapemuzijobujura.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/91956211486.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/75665158613.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 5260 bytes
SHA-256: b650c0455ef57e25c0379b5a302ff3b2c13f4dece5d9b3fb905cf8fca584dba2
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10828 bytes
SHA-256: cd54dc711ff232927f8bf9d7e1fd2969081ea5660cd7b2ef0c2a5bcdb8f1b12e

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