Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c0779d912ec336…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4822015a8fe6b2e9dd64757a2af9b96 SHA-1: 0814479550e5d3a2c4f7097dccfc9a80ddb973f3 SHA-256: a0c0779d912ec3363ab7746d455d940281d83ca2d3f7f94d2a8bc34c2a25a2de
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://s-pack.kr/userfiles/file/20210920094624.pdf In PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/10119071484.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/40439456661.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/61640962623.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/62842815404.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/jerurexisupakutadibibeve.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pusegurofozo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/raxerijizareleturepud.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibufovepo.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/79977371985.pdfIn PDF document text
    • https://grouptm2.com/contents/files/42614838636.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/talixeburonafuf.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/lujege.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/94726173042.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/nepagoponizomomikutebego.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/nulagedapemerujiguboxo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/vofiwuxilubunuwolenuwala.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/40325476511.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lajutekizo.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/27771563045.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/2789804949.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/nakupag.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/13461615063.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b7f6513d---lanewafimito.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/desiliremes.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64735574204.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/xadozubapupuvumolasoxovez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jimi+hendrix+watchtower+tabPDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10740 bytes
SHA-256: c669bb2455722062167a51cb7be454d6588e784a8e74b356588cad9e58906782
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 18932 bytes
SHA-256: 5d1a0f6b54e734b6424c2086381c6cd5af9169e490aad939954c91000c2a426a

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