Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffbab5cab1376c7…

MALICIOUS

PDF

73.9 KB Created: 2021-01-07 21:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0644cdeb9fd661617e595abe2814c571 SHA-1: d869bf4a87f78d38780afde72168553a74969645 SHA-256: 8ffbab5cab1376c79ddfc7b1e37cf74534d0499896e1e3c72429dab83ab57e93
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. An embedded URI points to 'trafffi.ru', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'Ubuntu 14.04 lts iso' and 'wkhtmltopdf', likely part of a social engineering pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=ubuntu+14.+04+lts+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402718/normal_5f98b05842af5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5febec0b8499e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f9a7a0ee3f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fa777252d2ab.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/ggi7iiw/lord_master_king_riven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/68521d40-888c-41a7-8c6b-211919639be8/38385214474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7788b3d2-42b3-457a-b59a-960dde19a88c/the_wifes_story_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e177b06-b180-4341-9400-5f16202e7321/65980049462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9326e619-de9d-49de-a9d7-376e729c10e0/93910814686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627b9818-7c55-4d3a-8f1f-f897b5c56fd7/honeywell_6160_keypad_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/salman_ali_khan_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffd1f92-44eb-4f45-b03d-86982c98b213/jimanerewavorilefipevab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52085d5-4e61-4483-915b-a6125f89faa0/91379401823.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 4580 bytes
SHA-256: 815470638fc9cc7f2342d75a562b4a1a9e3b53dc7e241ece912ccc6863bdae6d
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10024 bytes
SHA-256: befe4f21d0b96a1cd7b06a169cd2aa858ea23b15a082546d955abcc9fe35ad1c
font_02_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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