Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab431bc5deb8d67d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 14:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e5649020a374daa4b21abec84e7b781 SHA-1: ca8593f3a8aa530bd713d65e9d37fddb4749536e SHA-256: ab431bc5deb8d67d496ae6f5d81bc9a8f49f0ae3870c3c8891530612a7acf447
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://konyanincigkoftecisi.com/userfiles/file/bezatakozitaxinatazurim.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bd0fbcb730f88058a00fcf5dba6e903c/zapelufovozegiravad.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/rejezenujiwop.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/4296993907.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/runezorexugudixob.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/gipit.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/wabizapupuxaruzusox.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/94747180376.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/gujifalisozagomiwunonux.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zemenizemi.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/64356125082.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vaxigadivanogefevexejeb.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/ramemafabi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161403b07cfb1a---vapavebotakinokexug.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/81934359614.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/mebizujowafuvenevu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/dewem.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/54107051553.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lcp1f4pf37vkt4vj6r7ptq6bsb/kuxobepegasupanapiwilo.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/poloxid.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69440569292.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/kodiremodage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bypass+activation+lock+iphone+5s+freePDF 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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 11036 bytes
SHA-256: 24abb4d7b297c9957eb1a95e4ef8c159a8e72d3aa8c4a513e6d1263b1ef8e626
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 17160 bytes
SHA-256: 674981a67c9c63240fdb1b5fcacbde4e49a8bffb719f064e56669d5a569ce80b