Malicious PDF — malware analysis report

Static analysis result for SHA-256 68477b293996c3d5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38009d154383240fed8124812b2fb381 SHA-1: d66649a92f85baf5c1640de2e70e17dbc2947a60 SHA-256: 68477b293996c3d56251a7b9a859dc7748799d7f2cfc5d45bff3a79be03ab946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cukorbetegshop.hu/files/84880009960.pdf
    • http://architettotamborra.eu/userfiles/files/18945016678.pdf
    • https://bak.vn/upload/files/pobidenuvekedosif.pdf
    • https://suacuacuontoanphat.com/upload/files/19037150512.pdf
    • http://cesurmakina.com/userfiles/file/23240425590.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/90697590316.pdf
    • http://songpinhao.com/userfiles/files/tikekepemunina.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/9720325938.pdf
    • http://a-kamen.com/userfiles/file/jajikakenajozinifa.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/16555145627.pdf
    • https://musikkursus.dk/userfiles/file/88515956315.pdf
    • http://szamosiszerviz.hu/feltoltott/files/30673699403.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/69057845615.pdf
    • http://ekotop.eu/userfiles/file/12297381370.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613589bc0444f---fusuxikenaragara.pdf
    • https://ecoolteh.eu/galeria/file/xogijekefovesupoko.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/27726163244.pdf
    • https://swaarm.de/app/webroot/upload/files/sufebokotojekusabopa.pdf
    • http://rencontres-icare.org/userfiles/file/16372509717.pdf
    • https://austdoorcaocap.com/upload/files/48222976846.pdf
    • http://volkshilfe-vlbg.at/images/content/files/68172427271.pdf
    • http://air-con.ru/upload/files/borosarafa.pdf
    • https://pracowniatechart.pl/fckpliki/file/6068229595.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nilekiriwavusizonu.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/63396868475.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=munnu+graphic+novel+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_off0000ec33.bin
e1cb3d8ff86ea2c4de0198c5ec05b5521a870db4e40300d888915167993e1e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 17648 bytes
font_01_sfnt_off000119b3.bin
398d256249514e252210078d6b600304bdebc7a9c691e888b131b4649dff1ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 10792 bytes
font_02_sfnt_off00013242.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 16792 bytes

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