Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf2d0dabf6785c3…

MALICIOUS

PDF

91.9 KB Created: 2021-10-11 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 020fbec774f82634b5f358a4ce5564b2 SHA-1: 643e1205a8998f06c4739559aeebc229306d89dc SHA-256: fdf2d0dabf6785c3e529d49429cf558955b347f5bdba26f1f01bd11601bc58ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript points to T1059.007, and the likely delivery method via attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://epoch-making.jp/js/upload/files/51577613916.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/40548356731.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/kifapomazazoniwofanesi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/81716270916.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9a07a4b5356487a975f96dffd7e1f414/povetakilenevogejulirebo.pdfIn PDF document text
    • http://cascad-trans.ru/files/60298487505.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/54034272722.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/77152277472.pdfIn PDF document text
    • http://irinabailey.com/upload/files/59091210563.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/ruborigemebegedafowozij.pdfIn PDF document text
    • https://ocw.tw/uploads/files/93011902925.pdfIn PDF document text
    • http://gaudi.tw/upload/file/75565658700.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/jejexefelurofugumido.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/zidesudegazir.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/rufakobiviwaw.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/90293203298.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/9346308978.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/kijufabugamag.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/46338912531.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210907092935.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/83804496876.pdfIn PDF document text
    • https://kimansion.com/uploads/file/vibez.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/81487379683.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d3e5fe907392a25073007db2302cce37/wobibagifajidelamagupu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=fun+quiz+and+answersPDF link annotation
    • 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_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 20776 bytes
SHA-256: b3d40ee5e9509346a5d9cfea51b437d7ef0eeca67efe1f50799d70ad441bd215
font_02_sfnt_off00014a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8D 10348 bytes
SHA-256: a8591ead405f0283540e338af780e7fa757c4ee2edf65a120cbfafb14aadfa5c