Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66f80641115f43…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 23:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56bb7b3499b6b07121ef2ed2fa0553e3 SHA-1: 37d51967684c05eab9b02cc0a2a76a286c10b248 SHA-256: 7a66f80641115f43dd0f3cae715cb757c06e46889013b9a1e686af81069358b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as a first stage of a phishing or malware delivery attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://theofficeplus.com/userfiles/file/68197423537.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/dudamotaxos.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/36028717099.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/talisifanerekurawuzup.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_79D7DB4E174C8580.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/famaturufojelitajori.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kenikawomuvov.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/xonawukukeke.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/45712308966.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210924_DD906D0B58605D31.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/54979496162.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/waluvuwizojizelawizuk.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/pidukenopupojigofe.pdfIn PDF document text
    • https://cncunse.com/d/files/bugilawaxexopum.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/8158655629.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/85976273648.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/16056140117.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fowovemosobazuxulobuli.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12244789758.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/wilutul.pdfIn PDF document text
    • https://senegal4d.com/contents/files/mugotudogedijuzitowor.pdfIn PDF document text
    • http://klenderbio.com/upload/files/lajuxuxanorazadiremog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=www+eztv+com+show+listPDF link annotation
    • https://en.wikipedia.org/wiki/eztvIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 16272 bytes
SHA-256: f2195b3cad618878d2bfb659d5cec358e619df60143a6e2c5a14f721544b061d
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10332 bytes
SHA-256: 0cb09ef06f0edbef52d45db7607f820da5cb1e29804bf3fb9926407567afac95

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