Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1dd701cbfcafda…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 20:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2a693d99ecbf15a6638f14331bbbb306 SHA-1: 9ef4e7bfcc160d1676eb7305506be5ba7dfb6bbc SHA-256: ac1dd701cbfcafda1ccafa9c04f50f47203ef89c711eb494c69ad400b52b79f1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this, suggesting the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/65271477186.pdf In PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/85438637969.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/37259170339.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/71268631299.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/natogup.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/97843567517.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/19197742418.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/repudofitosidefixogomive.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/92405914249.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1967713c---39518647605.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25357784796.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_7F8A2AE4E97F8E4E.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/vodadul.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/57560906530.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/47063320946.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/29dfl1pr40ju82gq05vm4g7hqv/kuzikona.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/83066360646.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fuzurelanoram.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/79602300714.pdfIn PDF document text
    • http://df-2.de/images/daten/file/woxivibelu.pdfIn PDF document text
    • https://mattress-leader.com/media/xebutisujuriremibakubej.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/firelixedugozobuzito.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/ganajewisaremojosejomoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pes+2020+unlimited+money+apkPDF 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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17316 bytes
SHA-256: 976a96214c96e360ca4e2c9f94340e33fff601c16afcfe358a9f8ff89544ea03
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 11000 bytes
SHA-256: 7a7b2c91d4c57e6076aea11d54bfeeb3323a593467563df29052affcf3940751