Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3bdadc5fe2f620…

MALICIOUS

PDF

75.8 KB Created: 2020-12-23 16:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 43c916c6f71a567303cbe3429aaed39d SHA-1: d19e8288aaa24d0b4827bc38359703336eed148c SHA-256: ec3bdadc5fe2f6205d5e6d59e7fd043cb3b37dc8dc0259ed7156b4cdf903fd7a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'trafftec.ru' which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=browser+philips+smart+tv+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fbb058f9998f.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/IZjbje2/citytopia_mod_apk_2._8._5.pdfIn PDF document text
    • https://cdn.sqhk.co/nugutobudan/uVhb4ij/83448256361.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/j7icjdw/hp_smart_app_for_apple.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/lodakugukaxir.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/zizewedujoz-litonalex-deduvinavodiru-nodimoli.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/mufetipexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5faa446e31494.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/4829363.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/goneduzum/fifth_harmony_new_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/corporate_governance_report_of_indian_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91942cf9-dca7-4883-a61f-da8ced443646/dukinexiwinukibura.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/tipuxalenigulitogega.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/python_string_format_escape.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/achena_prem_bengali_movie_free.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5188 bytes
SHA-256: f4bcf25c8d76f0be9f19a1edde1a4e14c2c9e0b190e9ddd65d86f10d71473a51
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10512 bytes
SHA-256: 2067f8922e55ddadbe40100c07d6aa79f6ff02cc28a15d3abf6106d2682c3e7a
font_02_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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