Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0fe04e42782cb9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-22 16:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28555355895e571acc6b5268d860f91 SHA-1: 517bce447653bc53181d7736943adeb86d2d763b SHA-256: fd0fe04e42782cb99cb01ae6ca6b07f2903235e62f2c6fe6013db17ca2f1c45f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the links indicate a potential for malicious JavaScript execution or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=integrated+chinese+level+1+part+2+workbook+online+pdf
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/bapiv.pdf
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/lawigig_fifuvokili_fepaduw_zisufenipag.pdf
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/8495414.pdf
    • http://boxberry-24.cc/pandemic_game_board_sizeupt5w.pdf
    • https://cdn.sqhk.co/pinofizulag/ib7vqge/whatsapp_video_call_background_image.pdf
    • https://cdn.sqhk.co/wuxofepure/ijtr1kB/dupont_tyvek_commercial_wrap_data_sheet.pdf
    • https://cdn.sqhk.co/vobipibomuk/ihgd1hb/jomasewituj.pdf
    • http://sewatumafuta.medianewsonline.com/baixar_o_livro_namorado_de_aluguel_em.pdf
    • https://cdn.sqhk.co/resilano/HgigfF7/pudemazanusasi.pdf
    • https://cdn.sqhk.co/keximovib/SjFzBjd/49234697978.pdf
    • http://smartcreditus.info/are_magic_bullet_cups_dishwasher_safet9gfu.pdf
    • https://suzagadagaxu.weebly.com/uploads/1/3/0/7/130775939/nonagebiwapukuvuvis.pdf
    • http://memaberenux.scienceontheweb.net/xomenoxepibuzeg.pdf
    • https://cdn.sqhk.co/ganuniwiku/jcsuhbx/venigexowudagobo.pdf
    • http://grigolia-studio.ru/mick_foley_have_a_nice_day_shirtg8ee6.pdf
    • https://cdn.sqhk.co/gapekozuwa/Skahcog/bet_plus_free_trial_sign_up.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_422a9e098ccc4736bc427eb332df6e16.pdf?index=true
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_26b304336c574a83a6612300e375880a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad0.bin
122df038bd11f4d9043928b46f5a32c3f7fb2026d2c1e7732b37f81a64111cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 5684 bytes
font_01_sfnt_off0000ee30.bin
eff8855e7ebd2788499a6b0aea0537199e6f29df893e40bb8e25de29a60c4c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10768 bytes
font_02_sfnt_off00011315.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 4324 bytes

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