Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8bd53a3cc6a7da…

MALICIOUS

PDF

66.5 KB Created: 2021-09-14 03:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c556428887be3b4fcf1055ecffffd12 SHA-1: 7b03567bdc9ed63e685f7666a2c381ea28bfa525 SHA-256: bf8bd53a3cc6a7daa4ed42eee483a03e4da09509188615d08839c778f43f67f0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination or to host a large number of phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

Heuristics 4

  • 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
  • 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://unitytradecapital.com/ckfinder/userfiles/files/96737581514.pdf In PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/bodipu.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/24874709702.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/gokarifak.pdfIn PDF document text
    • http://parateam.cz/file/92109021646.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/h0gpbg6u38ndsksfblvreg6c4g/69388644631.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631102163.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/welomur.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/78754205647.pdfIn PDF document text
    • https://lordoptika.hu/files/files/93807210399.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/76080898184.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/lisupirubu.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/litobexizemelokirud.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/44195327681.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/leludidikubeb.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/demivobunejawuluna.pdfIn PDF document text
    • http://sakra.sk/storage/file/38994779232.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/37389559722.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/48158867283.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/jezejizoxemosomavaba.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rhn977kqe6h9t359rm516vdj9h/fogomaku.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/67646651924.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/25958871308.pdfIn PDF document text
    • http://krzeptowski.pl/file/56485080737.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/wewujodogakefowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=messenger+video+call+picture+in+picture+iosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 10848 bytes
SHA-256: cd8d53c66ccf53046e20aa2dc64e5b34ccb36a7404728752c92fd14dce05e24e
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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