Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda8657b988e158c…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71bd784a2a9041d5575ea947fe40ffb3 SHA-1: d7484ccb7012e76c88188c868f5684424522d438 SHA-256: bda8657b988e158cb3c297829c8b8cc5d72fe2b28b00868af5897263c2888092
104 Risk Score

Malware Insights

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

The file is a PDF document that contains multiple embedded URLs, one of which is directly referenced in the document's metadata as a potential lure for exam answer keys. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the presence of numerous suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • 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://dafemum.ru/award?keyword=tnusrb+exam+answer+key+2020+pdf+download
    • http://pakekoramiduwin.getenjoyment.net/cedric_grolet_book.pdf
    • http://lololoj.sportsontheweb.net/21710447203.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_605144edf1a3a.pdf
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5feceba715ff3.pdf
    • http://kutatit.getenjoyment.net/un_mundo_feliz_aldous_huxley_espaol.pdf
    • http://popularchoice.space/bibi_fatima_ka_mojza_in_urdun7vcy.pdf
    • http://newberginvestmentproperty.com/how_to_heal_chigger_bitesqkifr.pdf
    • http://discovljzg.fun/776881889242qp75.pdf
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60074d280a2f9.pdf
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fe2bea0634cf.pdf
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fd1879b3dd3f.pdf
    • https://cdn-cms.f-static.net/uploads/4470540/normal_603eeb45c2071.pdf
    • http://gopidap.scienceontheweb.net/loxulipazebep.pdf
    • http://zootime.store/free_puzzle_templatezle16.pdf
    • https://cdn-cms.f-static.net/uploads/4382953/normal_601b0cff3a030.pdf
    • https://cdn-cms.f-static.net/uploads/4382618/normal_6043f26b74a28.pdf
    • https://cdn.sqhk.co/sigidezok/3hh22Zu/centipede_grass_identification.pdf
    • https://cdn.sqhk.co/susononuz/8gegdjc/coin_master_free_spins_promo_code.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lozomemogu.rf.gd/72157114420.pdf
    • http://jujewubimowe.rf.gd/bpmn_notation.pdf
    • http://nitumajalu.epizy.com/independence_day_anchoring_script_in_marathi.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_off0000e948.bin
fd07225ce535b65f6e375d8adae5a606d77b133a23deb89681da192ff082811c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 5876 bytes
font_01_sfnt_off0000fd4f.bin
6bbfb6ef8c4683c324d4632ccf685295b4ea283ddcc3b952a0c07f036f5b4394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 11272 bytes

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