Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37a11d368476f6…

MALICIOUS

PDF

92.2 KB Created: 2020-11-19 07:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 32b9d0ab4115b4e51c056a77e6ddd07b SHA-1: 29607cd178b0bf7319666eb5ea86de044ae59dba SHA-256: da37a11d368476f6cba6f3f9fa9bb0bc08f1add0e44ac99dcff234bd43eb3d80
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the document's primary purpose is to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/123?utm_term=minecraft+beekeeping+tutorial In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f924f000f07d.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87183d15cec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f96663f86600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f90a1712e465.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/3129052.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/5de535e7-e7e6-4c75-a515-fd031eba4290/partition_piano_paris_seychelles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5804edb-13dc-4bf5-bede-016d37b783cb/75274619675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a302377e-c94e-4afe-84a6-a79c0cf6e3e7/kaxobimukikek.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/53067871802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f421bbb0-a64b-4864-adf9-7621c61ebd5f/soruvufitovadabexopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/menurunners_san_angelo_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e14ccbb-2f3e-4f8c-9d99-ebe7c4bda765/.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 1696 bytes
SHA-256: 0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88
font_01_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 5212 bytes
SHA-256: b6ef8e6584f976aa522e754b364b2dbcd46d75506bed5731ffa785c3e20ae223
font_02_sfnt_off00013e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 10888 bytes
SHA-256: cf2ff6909c99e8b20ee9a1c04a88a328e020b16f4ce59caf73b0eff0a5ed1029

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