Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c21cfb12c11ea71…

MALICIOUS

PDF

105.2 KB Created: 2020-11-30 04:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3c9a60d7f98445a1a5e455c8490d15d SHA-1: 28a6ccf2c767ce47e925c5192c5b2551a3263b5e SHA-256: 6c21cfb12c11ea718ae66369a06869f2dd6178066d268c87eac7cbd852953544
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 0.9998

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/strik?utm_term=directional+derivative+calculator+xyz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5fa4f43d6545d.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/29b4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f9b6ff1411d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f894fef91a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fbe56f85e5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5faa76c888fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5fae131c59fb0.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/4f0cee1b3e9da03.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/0eef8e3f-062a-460a-ad50-6a580340c41c/16316201594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d67618-878b-4b28-84e4-0d7bcd131bb2/crossvent_2i_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8dfc58-4db5-493f-b6a1-65837a89eb44/78789036802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e93ac58-2660-417d-b2fb-704de325063b/94252620105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f82e6e4-6237-4ad0-a3f2-cf13b116e01f/english_through_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525a40b1-04c9-4c48-a773-fdd975b7db87/deregunijew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339dd012-2d41-4551-9707-a2283924d98d/fopoxoreb.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_off00016316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16316 5032 bytes
SHA-256: 43f744e4790c163e421d85e348581c354db8221567b0938b3aedac21f69e62b2
font_01_sfnt_off0001745d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745D 10536 bytes
SHA-256: 4790734c2e384523193b56535a0d8474c7df78b4b6b9b71167f3bab7d91fecdd

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