Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c955be7d1460b1…

MALICIOUS

PDF

79.9 KB Created: 2021-04-05 12:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d08577240a1888f59f1dd00f56c50bf8 SHA-1: d61ee5a533651e714edb55c2f5f87afeb81b05e8 SHA-256: e9c955be7d1460b184450cbbce926e938804707be922f049a16520f9c6375890
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is part of a link farm designed to host malicious content, with multiple external links pointing to PDF files. The document body, though heavily obfuscated, contains elements suggesting a lure for downloading content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=isa+p%2526id+symbols+autocad
    • https://cdn.sqhk.co/farukisinu/iagfVht/suzomudoxepozewuworu.pdf
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/jofev-wabolejazilepas-guzamoxipin.pdf
    • https://cdn.sqhk.co/defisepeniba/nhdBgfS/gogeginivunofum.pdf
    • https://cdn.sqhk.co/tibakekavero/iiBFQQQ/busupenadafamevokara.pdf
    • http://tehnikator.ru/todukefugogijaakpsw.pdf
    • https://cdn.sqhk.co/modajili/3Tibjiv/trap_world_cup_2019_date.pdf
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/gozoken.pdf
    • http://dmdmassage.com/remington_700_stock_cartridge_holderlgsrw.pdf
    • https://cdn.sqhk.co/negolura/7Gibjh2/teaching_strategies_creative_curriculum.pdf
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/mogaramuxaxen_kojupig_nifava_nutozodomudi.pdf
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/niduvozawavadakumu.pdf
    • http://teleporttur.ru/34996496an1b0.pdf
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/2852345.pdf
    • http://salizurewaki.mypressonline.com/fakaxuxulunijarevexeza.pdf
    • http://udilische.club/how_to_sync_verizon_fios_remote_with_samsung_tveoqgr.pdf
    • http://lassituda.online/nubobuneweragalamozivauxm7m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_9951b290cecb4bbcb2e99055956b1ee3.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_52aac828aba64604b329c565640af4e5.pdf?index=true
    • http://jokosen.atwebpages.com/fundamentals_of_english_grammar_5th_edition.pdf
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_86ba6a72decb449da8474c39d27c1bb3.pdf?index=true
    • http://zipemoluligera.myartsonline.com/oral_cells_and_tissues_garant.pdf
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_6b7129d894e14f9d8f1534092fdbc0c9.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_b0f367d18dcc4f51a507354447acdc18.pdf?index=true
    • http://vawirir.atwebpages.com/why_did_defending_jacob_change_ending.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_off0000fda5.bin
939922803edf281b274a20c943d27b1c098224149f51b8dc942b6d816830d729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 4620 bytes
font_01_sfnt_off00010d71.bin
417f0822c62974c50e1e5e1606c53a630e1b81f850c40b6d7a92fe9200daa958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10712 bytes

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