Malicious PDF — malware analysis report

Static analysis result for SHA-256 172b4b1e6013c19b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 05:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8ab7b46eb2844d471f8ace427c675d7 SHA-1: 65f630f872f408580a0b068fce4eecd64e78c2c5 SHA-256: 172b4b1e6013c19b4eb5f1e26c199f72a38a01a01f930880ccaaacc4d66e3619
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beysukonaklari.com/ckfinder/userfiles/files/9804065800.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/1130794182.pdf
    • http://mobydick-band.de/fckdata/file/44077738379.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/23782762757.pdf
    • http://julianina.de/upload/file/34694686217.pdf
    • https://shivajigrihnirman.com/singhania/downloads/file/ruxefifewuvegaxemakexi.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/tepewekajopunepojux.pdf
    • http://sapthagireesyathra.com/userfiles/file/61395316211.pdf
    • http://wedding-box100.com/uploads/files/202109021518097807.pdf
    • http://www.culturehousesun.org/photos/file/pagemawedan.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/15433258840.pdf
    • https://rakowka.pl/userfiles/file/zomegifotesobevetol.pdf
    • http://zerosquareonline.com/file/99933586749.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/34300332446.pdf
    • https://vilnius.cvzona.lt/resources/img/files/75085002424.pdf
    • http://excitechem.com/userfiles/file/17369002994.pdf
    • https://bednidhitraders.com/userfiles/file/besejelobasovexafivo.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/limotuxu.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/77201418421.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/porivesidajuguwo.pdf
    • http://dragonera.cn/admin/userfiles/file/tofokinofovimakusevoxuga.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb67eb4f1a---dimolipixadunevazuxiwesil.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/73371270827.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=extreme+suv+driving+simulator+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e207.bin
c393d19150b1f6344b24b45b2e79a80c4f8a57a1ea9418d7af95e77e678cdc2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 17856 bytes
font_01_sfnt_off0001104f.bin
f1410bc0d0fd6e63e1d9681c4b27f86030f92aa009ebd9f78c4621a4ab9473eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 11080 bytes
font_02_sfnt_off000129f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes

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