Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c635e555e3d561…

MALICIOUS

PDF

96.8 KB Created: 2021-10-08 21:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 764498e399d3af242fd18b6b97268ffc SHA-1: 87c032df68ac1aa8be957045d2e4516e2f5fbf27 SHA-256: 57c635e555e3d561530b0ae4cb1d315b17cead6589cb0597d92eb2e73c87f101
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://cructi.ru/uplcv?utm_term=particle+motion+from+equation
    • http://gpszone.hu/upload/userfiles/file/fonusulimevaxa.pdf
    • http://elma-itc.ru/!upload/files/11339405494.pdf
    • http://streetnn.ru/data/upload/ck/files/duguvekubiju.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/posajukerorivedaleri.pdf
    • https://macjiboter.macjahisa.si/files/file/turovefeden.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f9c9a1c8---31587973729.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/799af82c58f3b35b1509c23b299b5bdb.pdf
    • http://synhbio.com/upload/files/71494264731.pdf
    • https://ecotranslation.ca/upload/editor/file/32454996869.pdf
    • http://reclameindex.nl/images/uploads/61756800819.pdf
    • https://clickbox.ro/images/file/92211568268.pdf
    • http://sayarbobinaj.com/file/40918558821.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/fefupimonep.pdf
    • https://danielfelber.ch/userfiles/file/12123639897.pdf
    • http://aldo-ins.com/userfiles/file/22268576858.pdf
    • http://tantusmarina.com/UserFiles/file/moliti.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/38338517872.pdf
    • https://burlingame.com/wysiwygfiles/file/zizowovagu.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e55443cfd---kosivipunujemunulorerulu.pdf
    • https://mmszke.hu/files/file/zepagawemejafop.pdf
    • http://kammed.com/userfiles/file/lulezimukupunowede.pdf
    • http://dragonera.cn/admin/userfiles/file/telapifizewozavipubeviriz.pdf
    • http://twozonechickenlasvegas.com/uploads/files/xurawotolutukuwiz.pdf
    • http://huzatfokozo.hu/editor_up/50851010423.pdf
    • 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_off00010c3e.bin
5850540d0de7ee6fe96c392ae98fb5f920f080dc1d6fb94ec88cc5c131c369b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10576 bytes
font_01_sfnt_off0001245b.bin
e582ecd0ee4f3f2368fda81fbcda4e6811ed58c1990ebaaddff2374432a92ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 21968 bytes
font_02_sfnt_off00015de9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE9 16792 bytes

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