Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ee290caf34a818…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b1e641a03a6c8a9fb1a97f344d4db87 SHA-1: 9b23cb0ccda9c75e27f1000d82ac288213399715 SHA-256: 29ee290caf34a81887acef20b6c2b3d86de1d567ecb5ab41a2eb1ae4c9b62cb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=minecraft+small+castle+designs PDF link annotation
    • http://problemconsulting.com/img/download/files/bekesolube.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cde93b9b4e1c1a103c443b7236eecfa9/xedivuji.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/fufuxemagikeferonogobopol.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/39169481447.pdfIn PDF document text
    • http://stattus.com/assets/file/9493655136.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210916142959.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/58290882438.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/94796555626.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/79926931451.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12857182790.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///pixesoz.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/28825360906.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mejomidedukevej.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/379d320f7eaa08be388cbd9f9a864e41/fuponipiwifapememepesum.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/55204301176.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/daveme.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/befenakomoziwiremofid.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917042714813.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/mutavunazas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 17964 bytes
SHA-256: 0dae1e5e618cf7cd96434dac38a9e8b3137b22342220cd85ee9c4c513e6e1806
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10692 bytes
SHA-256: efb7b888d28cb22ddb244004dac6c3e463451df13c1ecb540e433ebb44f17d96

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