Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c1ae9b2a424606…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 17:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5969f506772a05058285fd01101234df SHA-1: 3a5f34a53d00f29500f50e3844277d2725aa2aec SHA-256: 96c1ae9b2a4246061c48077fcf67870a08c805c6c7ccec6be28079a790e23307
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded, with one heuristic specifically identifying a 'disposable link farm' pattern. Although no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wumag.pl/userfiles/file/buzuxanimiwekidepavimok.pdf In PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/nerosikasaxazog.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/tusixilikijefuzaka.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/zofekowa.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nejekanenekon.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/simesivemozan.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/61653099127.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614516e834720---79941425337.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/xoner.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kagonixikatufanagixud.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/2385703286.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ravalatuwodiranosa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c617a4ce2183dd2797238398b172edc0/41475480515.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wusigofexanefet.pdfIn PDF document text
    • https://ksboutlet.com/file/files/kazisumuxudetanove.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/83310236527.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/36922693647.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912060722.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/76545965724.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/40051034136.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/52842185721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bus+simulator+hack+moneyPDF 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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 21128 bytes
SHA-256: 1c10bc93de7fdce73e671c7551fdd2ca969c91d59fa8ce737ae9ab32d8ff8c53
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10856 bytes
SHA-256: 324d3650f34fea712e292501581bb509fe7d469375251c2c84b404355c442bab
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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