Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5352a48942f0930…

MALICIOUS

PDF

61.2 KB Created: 2020-11-23 04:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 79ae8bc946f01011a2a29801a4ced84a SHA-1: 1217368165e15d8304f9630301f40719c390ef19 SHA-256: d5352a48942f09304e12541888c9296a739f9a496ed93f01073ae8087134ad47
156 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafficel.ru/123?utm_term=interpreting+graphs+of+functions+worksheet+kuta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476148/normal_5fab839ae250d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f96392d5538d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_5fb8675fb4c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_5fb491b41c877.pdfIn PDF document text
    • https://tufobedix.weebly.com/uploads/1/3/4/4/134431979/pasagonodisofarake.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f951b55944b9.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/6c4e2b32-2450-46de-b01b-657ae812138d/24250336044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46485499-bd38-40b3-a765-559d825640fa/dovowogotenubafugezabuwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4726d39a-18a5-4bb0-bee8-f91c50585b7c/44234789893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d0c74b-894e-49cc-8c53-a49277ee5bb9/80255834024.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/nixafisojizipunomufawow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97653121-85db-4d99-8e8c-c58df566b80b/49245295077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0812c99d-02b4-4dbd-ab26-c12c7c273c61/49669436858.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/something_like_summer_streaming.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 5340 bytes
SHA-256: 31e87ec8ac70b317bfb7c6293e5103e30f405871180370e9116df6ea8b6adece
font_01_sfnt_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 9860 bytes
SHA-256: 018cf157fac833170f8c2a694ed5b58556246aacb4adf4bdd7931be62e00ddb4

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