Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94b921c871134b2…

MALICIOUS

PDF

82.1 KB Created: 2021-03-30 21:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf85f01983c341b4dcecefc015a6283 SHA-1: cfd739561d5fe9d959a8379df91ff171212333d1 SHA-256: b94b921c871134b24c03dbe00051e66a103e3192a0805ec0ae83378ae1a75303
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://yafferge.ru/award?keyword=acrobat+pdf+editor+mac' is the primary indicator of this malicious activity. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the PDF structure and URL are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=acrobat+pdf+editor+mac
    • https://static.s123-cdn-static.com/uploads/4371809/normal_5fca34ef546b7.pdf
    • http://biomanua.website/376857658671js8v.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c8093add.pdf
    • https://cdn.sqhk.co/pisupuwov/hJgeVib/73555902417.pdf
    • http://xtreme-sport.ru/all_about_stock_market_strategiessj0d6.pdf
    • http://lajafago.medianewsonline.com/77629185821.pdf
    • http://shoop-fm.ru/gb_whatsapp_unblock_apkwur6a.pdf
    • https://cdn-cms.f-static.net/uploads/4411683/normal_604ef1e699bd5.pdf
    • http://betmoy56.com/fingerstyle_guitar_long_nails39mt9.pdf
    • https://cdn.sqhk.co/mivadunoxo/gfdifgi/bluestone_and_hockley_reviews.pdf
    • http://meriline.store/what_i_eat_for_life_maddie_lymburner76qrg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/minaxigevani/keneweterogojemirusex.pdf
    • https://s3.amazonaws.com/makumapikeze/physics_oxford_dictionary_apk.pdf
    • https://s3.amazonaws.com/tinivukedeta/80192642410.pdf
    • https://s3.amazonaws.com/jopomodilamego/university_of_penn_information_technology.pdf
    • https://s3.amazonaws.com/fomudebipefasu/fractions_and_decimals_worksheets_grade_6.pdf
    • https://s3.amazonaws.com/novifamigot/44244496952.pdf
    • http://zaxuzut.atwebpages.com/17848523888.pdf
    • http://faxiruvud.myartsonline.com/28047574465.pdf
    • https://s3.amazonaws.com/fatisake/gitea_config_cheat_sheet.pdf
    • https://s3.amazonaws.com/juwofuxufijup/analog_lab_3_free.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/jomazoteziz.pdf
    • https://s3.amazonaws.com/bisiku/pmd_eclipse_plugin_zip.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_off00010141.bin
ebf6cd84147d6bdc68677d88a28dc59354c40bd33e7808569e87f01232ea1a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 5220 bytes
font_01_sfnt_off000112f1.bin
f735078e3fb8e45f818585e4f74b07cdd1425f4c97275428076a2b2e4c13dc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 11416 bytes

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