Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcef272066cebc6…

MALICIOUS

PDF

85.2 KB Created: 2020-12-25 20:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c03fe92f5fab2c1f41a6cea1a6d83d0 SHA-1: 19880cd59b0d3fcedd009521e4bff1bddf24090b SHA-256: efcef272066cebc6be2f3ac6b97d6c56d2bb399a9e9df3d112fd9b8a437bdb86
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential link farm. One of the external URIs, 'https://traffset.ru/123?utm_term=catch+the+wave', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=catch+the+wave PDF link annotation
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/ziliror.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/9giwSjg/43776288840.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/b8a4d85276f41bd.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/pafiganovavi/69937954091.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/wupekuja.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/att_insurance_claim_iphone_x.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/piminomumomawesetirig.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/nepik.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/30841457336.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/competency_based_interviews_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/77868195877.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/48779166137.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/25176107883.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/31474634685.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/vazizi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 9500 bytes
SHA-256: 4911d50edfb9fbe758791c85ff61d23c253423691c341c4bdb4a475b4179429b
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 4280 bytes
SHA-256: 58d917c9764980a39e8731216b86209655c17313a2b66c91919a51d4a635ec5a
font_02_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10528 bytes
SHA-256: de363dd62fce22cb0a02bb4ec8b8a9977a925f68568abfaec0c00ebe94f72b42
font_03_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16136 bytes
SHA-256: dd9e40a08496e8b1f834fc8b983070530c5d2d8439449aed5e2672e064a9ff21
font_04_sfnt_off0001391d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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