Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d45c707948d02e2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 04:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74cc4b3c0b537f64a717a029aff43b6d SHA-1: 9eeea43c56768c6281652b44dc1169b51127ed89 SHA-256: 7d45c707948d02e2f27cb345639e19df8569ce37be2089068007541005bbb337
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or spamming campaign. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://af.ssla.ru/images/fornews/files/seravetulu.pdf
    • https://resttour.com/images/userfiles/files/52895002191.pdf
    • http://osmed.cz/app/webroot/files/files/60540034290.pdf
    • http://duhochoangthanh.com/upload/files/42828947664.pdf
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325514a2809---24594343705.pdf
    • http://innospectrum.eu/hirlevel/file/76755411035.pdf
    • https://linhquan-group.com/upload/ck/files/jobinobowifutojumotesipo.pdf
    • https://cargoservice.pl/cargoservice/userfiles/file/wamozotelisonudop.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/50496540588.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/xuxedumagexuna.pdf
    • http://ambvetfanini.eu/userfiles/files/novazu.pdf
    • https://mkontroll.hu/File/mozuxuj.pdf
    • http://baove24h.info/upload/files/kogapifomo.pdf
    • http://baloneacessorios.com/_upload/file///silajesamixonisakano.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/64210802680.pdf
    • http://ooexperience.be/assets/Image/files/65066577060.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/pugavesovoniwum.pdf
    • http://geomanteia.com/userfiles/files/42372926608.pdf
    • http://bjdfszwy.com/filespath/files/20210915190953.pdf
    • https://ans5680.preneed91.com/upload/files/jogirubavax.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/67391942732.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/70593135602.pdf
    • http://safiorida.dk/operatori/userfiles/file/fedusukif.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/58181489877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+sfa+account+generator
    • 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_off0000b231.bin
52c3f78ee48c2eb0b535ed34874d72afb91b9b623099f39243039c820c2ed64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 15808 bytes
font_01_sfnt_off0000d9b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16792 bytes
font_02_sfnt_off0000f1ce.bin
d295cfed537743d0596b075b1133cb431e8569c19cfabef263731c176219a9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10556 bytes

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