Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7677b497d44e317…

MALICIOUS

PDF

72.4 KB Created: 2021-02-12 21:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 584ee428328dfcc0be352e569d1d668d SHA-1: 737ced33331a51783963e0ae3fe2fe768503c3cb SHA-256: f7677b497d44e317d0f79db6905e0b6c693c8e49d95a94b68772e796431d6151
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=the+boy+in+the+striped+pajamas+characters+pictures In PDF document text
    • https://cdn.sqhk.co/menidume/DNhfi5K/19467864175.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/6116433.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/roblox_piano_keyboard_sheets_faded.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/2911258.pdfIn PDF document text
    • https://galibemad.weebly.com/uploads/1/3/1/8/131856827/fda3fa36d8f.pdfIn PDF document text
    • http://antonio-ita.space/jijozamimufpp0k.pdfIn PDF document text
    • http://susurrus.space/jogos_xbox_360_lt15ce7.pdfIn PDF document text
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/6754862.pdfIn PDF document text
    • http://xakovakaxevasul.22web.org/75029021923.pdfIn PDF document text
    • http://bit-ipo.ru/bellevue_prague_guide_michelinyokym.pdfIn PDF document text
    • http://rawivipuzigel.iblogger.org/the_fools_who_dream_piano_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubetujuna.rf.gd/94981224443.pdfIn PDF document text
    • http://rizusuzapil.rf.gd/stardew_grange_guide.pdfIn PDF document text
    • http://dagapevas.rf.gd/9933267257.pdfIn PDF document text
    • http://deweget.rf.gd/minority_report_cast_and_crew.pdfIn PDF document text
    • http://nibijebe.epizy.com/my_boy_emulator_pokemon_games_free.pdfIn PDF document text
    • http://kakogajoxe.epizy.com/zasavofumomukixomafaziru.pdfIn PDF document text
    • http://kefixofelapadi.epizy.com/top_100_unanswered_questions.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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 5548 bytes
SHA-256: e127c44dc351c8b0e1711e667b3225869f7564027817efeea21813240549b24d
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10048 bytes
SHA-256: b992b566df7f626416cad5384190e503e694350df552e4962dbdcc51b02141fb

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