Malicious PDF — malware analysis report

Static analysis result for SHA-256 25447767a9bee8b4…

MALICIOUS

PDF

87.1 KB Created: 2021-05-25 04:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9f07a6969b5201f88a2d25524a9c4de SHA-1: dc0746294ee1c5e857025215a01e884ca052c5ec SHA-256: 25447767a9bee8b4d359e4c3afe3d98eb81b2b44dab8d993b9aff058828ac0be
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, with 'https://ponafet.ru/strik' being a prominent example. This pattern is often used to distribute further malicious content or to engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+many+tires+to+build+an+earthship
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/6005512.pdf
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fc68e4c55486.pdf
    • https://cdn-cms.f-static.net/uploads/4382004/normal_605aed5563275.pdf
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/e7efa5b795335.pdf
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/abfa9.pdf
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/buperofosareg-romorowop-nitatelawopatu-risit.pdf
    • https://lisujawot.weebly.com/uploads/1/3/6/0/136024823/878a7ce18a147.pdf
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/niloge.pdf
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/wodubonelufudiguxi.pdf
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/7d0fbc51419.pdf
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5fdd5c668b568.pdf
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/lukilaronivuf.pdf
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/1c0fc0f4a1c63.pdf
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/guborikinafinez.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_601f9bb6be6d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovibu/lugufonojudivebizu.pdf
    • https://s3.amazonaws.com/dubiditiginowo/xaranajinewabud.pdf
    • https://s3.amazonaws.com/niporofez/15176142684.pdf
    • https://s3.amazonaws.com/benubapopikaj/74712403706.pdf
    • https://s3.amazonaws.com/rovikibixu/journal_citation_report_clarivate.pdf
    • https://s3.amazonaws.com/fodose/can_you_practice_vipassana_meditation_at_home.pdf
    • https://s3.amazonaws.com/mesotodimus/89737187683.pdf
    • https://s3.amazonaws.com/falejogajir/defying_gravity_easy_piano_sheet_music_free.pdf
    • https://s3.amazonaws.com/faxaxos/fun_illegal_things_to_do_when_you_re_bored_in_quarantine.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_off000117e9.bin
cb6a87fc30cb7dfe788c325dfaa3b07e3741d144412370e9466528a9ec15f01a
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 5492 bytes
font_01_sfnt_off00012a74.bin
67927a74bbf0bb2bf5ec7ae971949d18520bf2c4ce0d222acc0ebb3b1d71724c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 10704 bytes