Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c90d3a700aa36e…

MALICIOUS

PDF

71.6 KB Created: 2020-12-17 16:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ee3360142c8d89aefee651d3ad53945 SHA-1: bbd293640689087f68573a9ab003ce203dfbe026 SHA-256: 03c90d3a700aa36e3cb44ddea8c42f7c5df699126b9508c0191768f6c6471a5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, including one to 'traffking.ru', suggesting a link farm or redirection to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=spacemacs+evil+cheat+sheet
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5fb4d410d4ce9.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/jibuxage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc5d2deea4a794d56670281/t/5fd60ec8491a58544a07610a/1607864009038/bed_bath_and_beyond_fitted_sheet_only.pdf
    • https://s3.amazonaws.com/wizuluworafid/risk_for_dvt_nursing_diagnosis.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/guided_reading_lesson_plans_grade_2.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/accounts_tracking_spreadsheet.pdf
    • https://static1.squarespace.com/static/5fc17dd3405d5340f32dc63c/t/5fc3b1223c02f22b9d7dc245/1606660387396/bacteria_and_archaea_differ_in_1_point.pdf
    • https://s3.amazonaws.com/pafexegud/81477176596.pdf
    • https://s3.amazonaws.com/purufiz/49352550435.pdf
    • https://s3.amazonaws.com/votawawo/tuwex.pdf
    • https://static1.squarespace.com/static/5fc35f2d403f5353fda58b0d/t/5fcd621d9aa2de0c64a5f71c/1607295518728/46267570755.pdf
    • https://s3.amazonaws.com/rodiligarexo/ccpa_full_form_consumer_in_india.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb55.bin
962ad18ad4e934e63a97c316d3e973274d49d878cb8b2cc516bf9168635d6405
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 4812 bytes
font_01_sfnt_off0000dbac.bin
6c1e3d975cdb5ff96b8573d6f0ffa49499aae98ea4a043303397ef85b1a7d582
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 11700 bytes
font_02_sfnt_off0001036b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 4324 bytes