Malicious PDF — malware analysis report

Static analysis result for SHA-256 426eb8b685640928…

MALICIOUS

PDF

72.7 KB Created: 2020-11-23 06:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2a8c99603e02377f1596ca90a7e52f99 SHA-1: d326eee89182b55657800164c9815cb7865732e7 SHA-256: 426eb8b6856409281770a583e8ea4e9f2d03d8e4d12f702f7ab0f10285bb4b38
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary URLs, trafffi.ru, is associated with SEO link farming. ClamAV detection and ML classification strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic suggesting a tactic to distribute or mask malicious content through a network of linked documents.

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
  • 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://trafffi.ru/aws?utm_term=dividing+fractions+with+common+denominators+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f923ea99e2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_5fb539c73938d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f8fc1ce54e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9474f9ee39c.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/6315037.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/1388067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fa66b62e7d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa344015e9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fa8795c96759.pdfIn PDF document text
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/1226099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f87ff99946ea.pdfIn PDF document text
    • https://jifemeput.weebly.com/uploads/1/3/4/3/134398411/552994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f92fb7ca138b.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/tonikaneb.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/xanebavifamopez/capparis_spinosa.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/of_mice_and_men_mood_and_atmosphere.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/morse_code_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/top_10_free_cracked_software_sites.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 5408 bytes
SHA-256: 9594831e8ac305b6cfbbb41e4c175969fa874c71cb83e0f741de9d24ae22fdb7
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 10220 bytes
SHA-256: bb494ac9d67df16bdbda6fde623ab8cbb46e2d501fc56e16d9d0ad20556ff669
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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