Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c10c4240706a9e3…

MALICIOUS

PDF

91.4 KB Created: 2020-12-17 15:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cd770145ff47c6f6b4a17ec37605a8b0 SHA-1: f34cce653ec86b879adeb6001a70f397393a987d SHA-256: 3c10c4240706a9e379b21bceafcfbbcc93d771a578d90b8d8d4d9725400f8e45
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'traffset.ru', suggests a link farm or redirection mechanism designed to lead users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users, likely through a phishing or malware distribution lure.

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://traffset.ru/aws?utm_term=panda+antivirus+apk+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5fb3818dea024.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/2656290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fd1c948756f5.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/9e7c43c81480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd66f44b36f7.pdfIn PDF document text
    • https://lujalidulosegex.weebly.com/uploads/1/3/4/3/134369289/8237413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5fb5dd7c6a6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fba1342786c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5fc3d46274c71.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/jusoro.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://s3.amazonaws.com/kotodur/nurse_uniform_colours_meaning_in_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/7890129028.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/whatsapp_app_free_for_windows_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/nozow.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/wuwekilerojagurodakuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/pesunu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/luxomojesifuj.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_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 4816 bytes
SHA-256: 5371629a65cbe325b7f86ba2ead944132a62decd3a800d21750a166e0bb49cfb
font_01_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 10732 bytes
SHA-256: 0386688395369c571d733666ea269414b30488643913288b2aa201977e888c9c
font_02_sfnt_off00015282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15282 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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