Malicious PDF — malware analysis report

Static analysis result for SHA-256 047cd8fa217d89fb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 02:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c5ecb158774507453d4d88ef0fe1b90 SHA-1: 6b8a5a9f068bc5603f25d158f3cc66fd605974d6 SHA-256: 047cd8fa217d89fb1c2ae43c6d9a7a0e329579bdcae752ea22fea63f90d32260
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cosmik-kinoteatr.ru/sadm_files/57870022750.pdf
    • http://mnogonomerov.ru/uploads/file/tanoxemumike.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nubunen.pdf
    • https://groupunsur1.com/contents/files/69004172308.pdf
    • http://panel2conso.com/userfiles/file/8602968057.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161388ef6bdd6c---nugiwekuwar.pdf
    • http://acmemask.com/upfiles/editor/files/46895785578.pdf
    • https://idd.no/ckfinder/userfiles/files/bopaduwol.pdf
    • http://yanartekstil.com/firma/files/5400332308.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/wasovif.pdf
    • http://gmicropilotes.com/uploads/files/wojupugeromux.pdf
    • https://mimzyonline.com/userfiles/file/60927291750.pdf
    • http://bielle-srl.com/userfiles/files/62902977975.pdf
    • http://parkingparts.com/Upfiles/file/sadipanajeseberelixato.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_28C1E764CF4C2E84.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/daniw.pdf
    • http://ministryofrum.com/memlogos/file/kadiwapenunapexegij.pdf
    • https://tch.lu/files/files/84232532011.pdf
    • http://ekonopuntos.com/campannas/file/77066314079.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/gulakujedoxunikodoso.pdf
    • https://drhuanghair.com/uploads/files/202109092046185194.pdf
    • http://akvatoria.by/UserFiles/files/vuniwekigekajavigogala.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53094cbb4---jaburewakepegupotazijex.pdf
    • http://floramarble.com/uploads/15154081169.pdf
    • http://canxetaidientu.com/images/file/22118435064.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+all+ads+from+my+phone
    • 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_off0000cc14.bin
e4a7361495be7b1692458d1b7737eb911687c54b687ad7ad147056e2c6269a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 10928 bytes
font_01_sfnt_off0000e549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 16792 bytes
font_02_sfnt_off0000fd5b.bin
c464bba7a44627371d13a1a5f2e326f2a15a681b0a53e8ebcf53649cb19e6d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 17696 bytes

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