Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f523e663baf2148…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 21:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb8d4e873a9c9cbe3a7b8a289e61506 SHA-1: fbb9bd1eac3919f1e8bd1e2a80339c170a5b4005 SHA-256: 1f523e663baf2148e409172a2139f5f0a4b4808eec83ee0e0c5f9ca42d019cc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=how+to+convert+imovie+to+mp3+on+iphone
    • http://uelzecht.lu/userfiles/files/51610060894.pdf
    • https://blugarden.eu/file/44399014591.pdf
    • http://ilkconstruction.com/Images/Media/files/kawenodol.pdf
    • http://skupka54.ru/upload/m/21868273223.pdf
    • http://avsa.org/sites/default/files/images/files/labajule.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/5142890539.pdf
    • http://dailymaytrogiang.com/userfiles/files/37368562092.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/daviratokijizu.pdf
    • http://www.nachtruhe.info/up/files/gasovolowaxejikapigidudot.pdf
    • http://orvositudasbazis.eu/images/upload/file/pajixekepituseturefaz.pdf
    • http://karinameal.com/imgdish/files/xarapaxamixor.pdf
    • http://maasmartcity.com/userfiles/file/momovado.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1491cf003---94480764159.pdf
    • http://joyearland.com/ckfinder/userfiles/files/gerimul.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614013135bd31---66650858554.pdf
    • http://unityproductions.com/upload/files/devonugibewuk.pdf
    • http://findusafranchise.com/files/files/7362986849.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/ladezipujomagigigozegiwo.pdf
    • http://sakulchaiplace.com/Uploads/file/19710409615.pdf
    • http://vxclouds.com/userfiles/file/jojuludodifegefabi.pdf
    • http://denis-lefebvre-services.com/fichiers/file/xarusadomapesadigudami.pdf
    • http://nuitsdartistes.eu/images/file/bosopepikuvilalurija.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_off0000d86e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
font_01_sfnt_off0000f080.bin
b1c97be261b61673475660b9860228cef405acf777299870fb66617086aacdd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17624 bytes
font_02_sfnt_off00011e77.bin
d15aaae9e7a58f153fb46c54c597e4759e4c294fea50430a21486256a134ae7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 10580 bytes

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