Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d533240ef28679a…

MALICIOUS

PDF

67.4 KB Created: 2020-12-22 22:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: aac4de3a341930f70e7979047a318c51 SHA-1: d5d58509b24db9ef100c6800155a756f346d4ffc SHA-256: 7d533240ef28679a3d37ecaee43467e04f4aac8258431e12814547ab5b872292
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, including a link farm detected by PDF_SEO_LINK_FARM, and a specific external URI pointing to 'trafficel.ru'. The ClamAV detection 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a phishing or trojanized document.

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://trafficel.ru/aws?utm_term=capcom+game+cadillacs+and+dinosaurs+free PDF link annotation
    • https://netaxodesu.weebly.com/uploads/1/3/4/3/134367037/079092140e3d68d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dadupawo/22934742989.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/17718134838.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/oscilloscope_calculations.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/jetemuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c195e009-6d0c-404b-abcd-57440070bf39/nexisilexesoxenefetu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/carver_high_school_montgomery_al_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/modern_combat_2_apk_all_resoulution.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/60679564325.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/48588380214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b65c4b7-d9dd-443c-8fa2-35e651cad2b3/rodirimodetofinob.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/soal_ujian_nasional_biologi_sma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85a24d5-edcd-4268-be90-2cd14446b807/94318268929.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 5380 bytes
SHA-256: c13aeb2703ca910c921dca4fe854474823eee06cd3802c35e9a916541edba6d8
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 9952 bytes
SHA-256: 6899f6e06ad4e6a64a9d9dc359a11e50c7612b52071395d019da96daf22b4085

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