Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd4965a8b6b003…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02342875a8f027477bf37897672464d8 SHA-1: cf9f8f0074edb9c47bcfaf840a6fefe1651efc53 SHA-256: 44dd4965a8b6b003ad775d6e571b5e3b63856f105ddd835aeed51c7d1518aaf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm on disposable hosting, likely to lure victims to malicious sites. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect users, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=yify+movies+official+website PDF link annotation
    • http://meteosputnik.ru/userfiles/file/xukutifadotafaxodudej.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/15383734944.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/wivafovifimigiwasa.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/58263176715.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/segovobeku.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/79868875766.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/73981170190.pdfIn PDF document text
    • http://lovesenergy.nl/file/nifoduvugibiloze.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/gitogoxotinepifes.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/16596168523.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/pewifafapeliri.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • http://terrietanaka.com/library/files/94404042458.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/30934030583.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/89790227496.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dofesapunupu.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/47657658566.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/jatetubuparazu.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/58916223025.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/99501584938.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qt41s92lpk3fgicueprtpc7tjk/85299314559.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/wusufawexu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/59795941081.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lowizotu.pdfIn 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17372 bytes
SHA-256: 71b3076566b2d83817cbbb5307d51a0628f2980118f2a9c7d28bd6b22fafc244
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 10680 bytes
SHA-256: 42b8ca5d8b958b8dd336ac8e41dc18f115b8a0dfef03b3394578e3598c63b1bb
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1