Malicious PDF — malware analysis report

Static analysis result for SHA-256 41881af09dbcec46…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 21:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e878cd6a2c579319dde123dd01e941c SHA-1: 142d6b3ba761f74777ac4a76a0e57c35d6141ddc SHA-256: 41881af09dbcec46c330dedb8226d6d6f43b6af15966f35ddf973ed945fac87b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning model and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sbkf.org/files/files/rilalikoka.pdf
    • http://goldmustang.ru/files/files/33546412295.pdf
    • http://onroerendgoedindex.nl/images/uploads/15119865517.pdf
    • http://solarexperte.ch/fckeditor/editor/images/file/waxapikavuxeruwitapejo.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/50781262624.pdf
    • http://5m-tti.com/uploads/image/files/49566668010.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/pijunod.pdf
    • http://malbreil.com/userfiles/file/dipimikatugofebifed.pdf
    • https://krzczonowice.pl/gfx/file/tefupakatoke.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vutqipqheepdj36n79ub83m367/tepugimepolobafireluti.pdf
    • http://saothienemb.com/uploads/images/files/pidawagipizavalejofotajo.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/36093639345.pdf
    • https://resulgame.com/calisma2/files/uploads/matomadilodo.pdf
    • http://cavusofis.com/images_upload/files/18334972212.pdf
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nabopibi.pdf
    • https://fasleh.net/Files/files/rawedutofe.pdf
    • https://zlato-eu.cz/upload/files/47736876007.pdf
    • http://sbsinternationalschool.org/userfiles/file/66858152357.pdf
    • http://younewstoday.com/task/userimages/file/vamusagomijodedixaro.pdf
    • http://belniig.by/public/file/fakabujofavapomulijaripol.pdf
    • https://bluza-shop.ru/content/File/68664582372.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/lekirolaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cambiar+teclado+numerico+android
    • 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_off0000e450.bin
22767f395d1ef988d4d49b9765e9163ddd7218d363a29a8a4212de2a1ec3fbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 10636 bytes
font_01_sfnt_off0000fc9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 16792 bytes
font_02_sfnt_off000114ad.bin
e7656c90e3be22ad45fb62f3125a8869f1b226b11c29c6cb033a1128946665dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 19768 bytes

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