Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42a1d02d6ff73b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 346241de7e04815f7b81ddbc11cab96b SHA-1: 5d0e3eb9d482d867fdcf5cd6d68ebad1bdedce00 SHA-256: da42a1d02d6ff73bced52c31f7dfb4faa667dacbb789bbee1108a9ab01ff70a3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing a malicious payload. While no scripts were directly extracted, the presence of numerous unknown URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fisioterapiasuzzara.it/userfiles/files/lotoxub.pdf
    • https://semangkamerah.com/contents/files/8511244059.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/70229378182.pdf
    • http://shesob.com/file/files/24904145920.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/36665765159.pdf
    • http://kredoteka.ru/uploads/file/27828017612.pdf
    • http://sujitonweb.com/userfiles/files/luvuredesejakusijexagile.pdf
    • http://uteambio.com/upload/files/6902441272.pdf
    • http://ketphatthinh.vn/upload/files/kodiwulalodakozimu.pdf
    • http://chafewyuok.handysociality.com/upload/files/jopubikevupawolavudubebi.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamesaxifagisasasezud.pdf
    • http://skupka54.ru/upload/m/58422556105.pdf
    • http://baraanduliaptti.org/userfiles/file/dexopej.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd26294a6---vewexaridatafama.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/33858649726.pdf
    • https://vanphongphampmc.com/upload/files/90486003956.pdf
    • http://gpshardorawal.com/hemkunt/userfiles/file/89961285640.pdf
    • http://racecross.com/upload/edito_fckeditor/file/batuluzaresalafaler.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/24646148702.pdf
    • http://imobilestore.de/userfiles/file/71551538516.pdf
    • https://clubon.top/uploads/files/38923359913.pdf
    • https://tonmathunglan.vn/upload/files/fezari.pdf
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/2989638503.pdf
    • http://www.puhito.hu/uploads/noveboburesupazarofe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=game+hd+apk+data+mod
    • 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_off0000bd55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD55 16792 bytes
font_01_sfnt_off0000d567.bin
98ee4a7b6e80c00d93a927dfca7c02eeba13c67e7cf8b22c01fb23bdc26567c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 19000 bytes
font_02_sfnt_off0001065f.bin
b2cc183daaa07c44217eec491c29f7bded85743714752b266d8287ac83932ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 10280 bytes

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