Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc715abc3e88893…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 23:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e082082166b26c8a1a5ded32a6f43996 SHA-1: 4e88e17c0384270ac5583b9167c9cc85896bd153 SHA-256: 0cc715abc3e88893ce8e981c2f0f62e3b87eb61645d66357fb3902eac5f2ca73
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically generated URLs on disposable hosting. The PDF structure and embedded links suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://olguanaokulu.com/upload/file/82346654020.pdf
    • http://volkshilfe-vlbg.at/images/content/files/vipedovujixo.pdf
    • http://verduciautodemolizioni.it/userfiles/file/72631061406.pdf
    • http://anduong-nhatthanh.com/uploads/news_file/49736942607.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/71156464900.pdf
    • http://humidorio.de/ckfinder/userfiles/files/vekijove.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/resezibixit.pdf
    • https://voyageaventurenepal.com/upload/files/92494425141.pdf
    • https://ambulatorioveterinariosismondi.eu/file/xosogonuxijofipofij.pdf
    • http://skiflogistics.ru/userfiles/file/satadisuviperaga.pdf
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/494e04c78af218d2e6f875cee0f97445/69121563840.pdf
    • http://apluskleaning.com/admin/images/file/51625582825.pdf
    • http://www.hausman.eu/images/wyswig_images/file/tinapavobawofitijosovuf.pdf
    • http://royalleasingny.com/admin/images/file/16108223399.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/6429824384.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e74b80ad4---28291039953.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/gelelusalukutabidefano.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/16388922834.pdf
    • https://burgaseguros.com/userfiles/file/vojinakowemipar.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/68278679951.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdf
    • http://augustaelectricalwork.com/editorData/file/15307920912.pdf
    • http://mirsistem.com/depo/sayfaresim/file/xebalerarifedaviselu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=true+skate+mod+apk+all+skateparks+unlocked
    • 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_off0000d408.bin
e4b61f5b6b2be3eb3bbef28060e1a4ebf6104fd2b9ba034b9952992b64e1ce7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10736 bytes
font_01_sfnt_off0000ecc3.bin
ed68f146ea9987e5fc9e3d33be7175406e0293203d6f5786b1451bd9d85ccc9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 17156 bytes
font_02_sfnt_off00011968.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 16792 bytes

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