Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f76f41371199f…

MALICIOUS

PDF

78.4 KB Created: 2021-01-23 20:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4f9bc909c496ff45d50375e9b6e01d47 SHA-1: 743d86ffd1574c850f45914a3068fc56640233bb SHA-256: a57f76f41371199f7f97c8b9bf107de3462bbe90c4f408912762d0e58b9947a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'trafffi.ru', suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be related to 'Discord syntax highlighting mobile' and is likely a lure.

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 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://trafffi.ru/123?utm_term=discord+syntax+highlighting+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd10660d2cc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ff933f6c4e12.pdfIn PDF document text
    • https://site-1174611.mozfiles.com/files/1174611/20238248504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_600a736ed0dca.pdfIn PDF document text
    • https://site-1168447.mozfiles.com/files/1168447/advance_auto_parts_jobs_application.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fda5dda4352e.pdfIn PDF document text
    • https://site-1177729.mozfiles.com/files/1177729/42691071540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ffaada3a6530.pdfIn PDF document text
    • https://site-1174448.mozfiles.com/files/1174448/29974107798.pdfIn PDF document text
    • http://takodevizol.iblogger.org/ibm_ts2900_tape_autoloader_manual.pdfIn PDF document text
    • https://site-1208189.mozfiles.com/files/1208189/medical_assistant_certification_study_guide_for_free.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/pompa_sodio_potassio.pdfIn PDF document text
    • http://kibizife.iblogger.org/32070879362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fdbe3e9ea632.pdfIn PDF document text
    • https://site-1237736.mozfiles.com/files/1237736/steelhead_fishing_report_washington_state.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd622ee0e9bf.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/gogunabones/sekafunogebekisuni.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/peos_module_7_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/untitled_simple_plan_piano_sheet_music.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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5452 bytes
SHA-256: 149d588f97b4bfc7489ae0b7c0ab16a6584a65e0e0a3d6ef9b0360d5f39c9250
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10992 bytes
SHA-256: fe60e260f527c96e38ca989f77ff11993d851e7ce4faf9eb03ceaca414eeaff6
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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