Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7683b78f086aa2…

MALICIOUS

PDF

67.4 KB Created: 2021-03-15 05:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2056dcdc396b328195990376746e75ca SHA-1: 52b2c54fd846fd7bfe66ce9bcfd9431e2e90892b SHA-256: ca7683b78f086aa2905653e498c68afde30887138683f52c783253a19ce1781c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=ethnic+groups+in+the+philippines+and+their+locations
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/7605945.pdf
    • http://wgathering.org/43360665193blkx5.pdf
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/3eac50647.pdf
    • http://hermidkovo.info/are_huffy_bikes_any_goodcx1al.pdf
    • https://cdn.sqhk.co/rivotoxupow/idyR1ii/95362895145.pdf
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/638829.pdf
    • https://cdn.sqhk.co/jaxabofapuw/hdifAgf/travian_kingdoms_wiki_trapper.pdf
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/solemubawegugemimaf.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/ab0e98e58.pdf
    • http://dmgameplan.com/elder_scrolls_rule34u5t19.pdf
    • http://temezisabekazev.iblogger.org/boss_ceb-_3_bass_chorus_pedal_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_5518381cd8eb44a5bc373f92cf315b43.pdf?index=true
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_17ccf7a5b8c845729f6553878489257a.pdf?index=true
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_dd866587475f429080f79f07df3ab97b.pdf?index=true
    • https://s3.amazonaws.com/tuzamada/adobe_flash_actionscript_3._0.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_2f42c54ca4b04e7b9c58b9f8aaac1ae9.pdf?index=true
    • http://jirarawoxi.rf.gd/evanescence_fallen_songs_free.pdf
    • https://s3.amazonaws.com/pirofopafu/7312309253.pdf
    • http://muzizax.rf.gd/silk_face_whitening_mask_sheet_skinfood.pdf
    • http://kipijitifexus.epizy.com/getamafonikoputopo.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_2388e4dd12ce43afb769922c5cf5bacc.pdf?index=true
    • http://sunimapoka.epizy.com/mepezabad.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_off0000cc76.bin
1d25be1edbb7c7a5d4f333b74ad863917cf091a195da4d612fc3219ff7b2117f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 5292 bytes
font_01_sfnt_off0000de74.bin
3c9872c0a880d484358a645a9bd6eb9e88f4506c31a4b925d2afb90135271489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 9836 bytes

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