Malicious PDF — malware analysis report

Static analysis result for SHA-256 423611ab230ec9fc…

MALICIOUS

PDF

81.9 KB Created: 2021-04-05 02:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba6a16e4b9124f2b486449968d70de5 SHA-1: 80b40dde59227bd6eb469404ef052196317e302f SHA-256: 423611ab230ec9fcd0beeae4a208b4f0904ce4a689ae1b21d11d1b84f5bcd342
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 mimic search engine results for medical terms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=anesth%25C3%25A9sie+p%25C3%25A9ridurale+technique+pdf
    • https://cdn.sqhk.co/sunomedude/ihYihD3/neposazagazudovulul.pdf
    • http://mozuganimaf.66ghz.com/printable_mathematics_worksheets_for_grade_3.pdf
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5ff35467335db.pdf
    • https://cdn-cms.f-static.net/uploads/4392854/normal_60290556577c8.pdf
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5fcc6dd42fb8f.pdf
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/fezipadovaj.pdf
    • http://tipipunir.iblogger.org/toefl_practice_test_sample.pdf
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60421b605ddf6.pdf
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/lasozirun-tatukuwo-zusijofuk-tojar.pdf
    • https://cdn-cms.f-static.net/uploads/4454301/normal_604951e2ae7ba.pdf
    • https://cdn.sqhk.co/jifegusewe/dihjhha/xezebazolitijobalewidojo.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fd659f2b0216.pdf
    • https://kefapadasogimok.weebly.com/uploads/1/3/4/6/134601884/25536.pdf
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/4c87b9.pdf
    • http://jizemekuguzu.22web.org/jexuvolanelirebiwewi.pdf
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/piginupejipe.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6014144bb7d4b.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6055b347043d4.pdf
    • https://cdn.sqhk.co/nomelafu/Sjagcja/24691815070.pdf
    • https://cdn-cms.f-static.net/uploads/4487423/normal_603563455d95c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafijukopa/sugonoxejagevakamakeluwi.pdf
    • http://fatufad.rf.gd/kezifowak.pdf
    • https://s3.amazonaws.com/satulibaren/70th_birthday_party_invitation_templates_free.pdf
    • http://fefuwosijar.rf.gd/moxaxefuxib.pdf
    • https://s3.amazonaws.com/titugome/sony_xplod_car_bass_box_200w.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_off0000fddf.bin
7302cceeba4423f094041fe9982dfba94978533ad0fabfead11f444a9ed49e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 5500 bytes
font_01_sfnt_off00011048.bin
2dbf87f67498b10b51652863ddf2478ef32479b3b39af60989c246f9f9970ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 12520 bytes

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