Malicious PDF — malware analysis report

Static analysis result for SHA-256 84032c8b2da2aec0…

MALICIOUS

PDF

60.0 KB Created: 2020-11-18 03:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da461816b2bd5f74c313145b6b3210c1 SHA-1: bc39423ae60fe269654ac9cbcdd71cebe889d29d SHA-256: 84032c8b2da2aec04dbfb68b038e4c62c2d0bca95dfc24cd96c0cd2ea603f9af
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one pointing to a suspicious domain ('trafffe.ru') and another to a PDF file hosted on AWS. The presence of numerous links suggests an attempt to direct users to potentially harmful content, consistent with phishing or SEO spam tactics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=you+belong+to+me+carla+bruni
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/vagetalog-juxifemaragepux-bobedel-kifal.pdf
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/d5735.pdf
    • https://gikusevenax.weebly.com/uploads/1/3/4/5/134529244/dirogurezumamelo.pdf
    • https://fesalepexixid.weebly.com/uploads/1/3/4/6/134660072/9044019.pdf
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/63521a8e65410.pdf
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/9087225.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mubefula/sakabir.pdf
    • https://uploads.strikinglycdn.com/files/294ca412-42f1-49e1-ac6a-b109ea2004e4/9579266139.pdf
    • https://uploads.strikinglycdn.com/files/a5d84df4-e26e-4eb1-8a1e-849387fca4bd/supreme_court_case_studies_worksheet_answers.pdf
    • https://s3.amazonaws.com/resixexi/group_3a13_element_that_forms_the_most_basic_oxide.pdf
    • https://uploads.strikinglycdn.com/files/ffab4dfd-75a9-4ed7-b554-190a4ac29745/93777612082.pdf
    • https://s3.amazonaws.com/fewifuwu/sengoku_rance_strategy_guide.pdf
    • https://s3.amazonaws.com/vajefam/excretory_system_worksheet_for_grade_5.pdf
    • https://s3.amazonaws.com/tabobujimo/aula_internacional_1_gratis.pdf
    • https://uploads.strikinglycdn.com/files/52f691c6-0bb8-467c-bb6b-5c9eb9d14dfe/ensayo_expositivo_ejemplo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad2b.bin
6c08d019f483d91fc02d2e92bd58d6e13f587d9cd8de93e8997255a250183a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 5040 bytes
font_01_sfnt_off0000be44.bin
91a6a8df3c23e9d65d1f358ec6e3f32e189c59c915917af9cbec9662ae160463
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 12400 bytes