Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73a667a6afc5d4b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 22:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ddc14cd180d19610dfec32756390280 SHA-1: f03183ca53fcbbde8a5d684b4c93a983b7ad53dc SHA-256: d73a667a6afc5d4ba5fe89931d83dfb9007ed8d4466ae8a808e5eee2513d274c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically flagged as a random URL pointing to a suspicious PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs suggests an attempt to redirect the user to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 https://eol.org.pe/ckfinder/userfiles/files/12452879299.pdf
    • http://aquaclub.hu/userfiles/file/miroxodakapiniki.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/83692973944.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/wunutitonamufuponot.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/17974568509.pdf
    • http://motolargo.pl/userfiles/file/dukuriposivumisapumom.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zomed.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161322e808c987---jadiwizadusapufurenane.pdf
    • https://costarica4d.com/contents/files/furupemedis.pdf
    • http://dogomanhnghia.com/uploads/files/golada.pdf
    • http://wedooverseas.com/userfiles/file/89067802478.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84be0c774---33248070271.pdf
    • http://egyptlance.com/userfiles/file/44710684581.pdf
    • http://quaisetoiles.fr/img_pages/file/pulolusat.pdf
    • https://evergreencans.com/userfiles/file/99161686045.pdf
    • https://al-farh-iq.com/upload/userfiles/file/87692019283.pdf
    • http://96stone.ru/userfiles/file/kedumurofaralaw.pdf
    • http://jwconsult2005.com/file_media/file_image/file/3935593253.pdf
    • http://yourmoneyyourbank.com/uploads/File/86497043950.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/xavutusudovisej.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/85070216510.pdf
    • https://vnsteeldetailing.com/UserFiles/files/lodino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dwayne+johnson+jungle+cruise
    • 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_off0000d16c.bin
739cf4af01d3d5d17a439c3d98c6ca0d69776b4f65295ecaf26b941873adb125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 17700 bytes
font_01_sfnt_off0000ffad.bin
4785d36612cd321ec9e9a5e54e15be4b49f1b0e5f3496e28ba3874bb2391fb8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 10844 bytes
font_02_sfnt_off000118ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes

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