Malicious PDF — malware analysis report

Static analysis result for SHA-256 3202bc5285b29735…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 05:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 365c2510eb7eba5204004b87ba194c05 SHA-1: db8d187f012595c0e16b82a1902c5ba439ba370d SHA-256: 3202bc5285b2973577ab3e21e5a73c2dd0e4560b19be6532eae45bce71f46b5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lauraestetica.com/userfiles/files/bujupilijelemuwuxebig.pdf
    • http://studiodugnani.it/userfiles/files/48176422104.pdf
    • http://letnipohar.cz/upload/file/38847534973.pdf
    • http://splhardware.com/UploadFile/file/2021090806050573499.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/mosifugidasa.pdf
    • http://czerwoneiczarne.pl/files/file/xoxadorepexodifuwe.pdf
    • http://daiichigroup.net/uploads/news_file/81621478207.pdf
    • http://shiinamotors.com/js/upload/files/fegipirivatixutig.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/veketugobajujidimibemexu.pdf
    • http://ljjxmining.com/uploadfile/file///2021090505030488.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd03047a18---68215469925.pdf
    • http://chothuethietbi.info/img/files/buwixozuk.pdf
    • https://pbpkrosno.com/fckfile/zikarisogasax.pdf
    • https://granitnet.hu/editor_up/fefaker.pdf
    • http://lexxyin.net/files/fckeditor/file/mopejikixoz.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6db5e4581---73416442472.pdf
    • http://optimaglobal.net/ckupload/files/tunopofubuv.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/ziwotafomibofan.pdf
    • http://skpizzasubs.com/uploads/files/wilotir.pdf
    • http://parentini.it/userfiles/files/61662772741.pdf
    • https://palezieux.com/ckfinder/userfiles/files/10747210292.pdf
    • http://optometrystaprzemysl.pl/userfiles/file/fopejunomenasojuwados.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hvorn%C3%A5r+kommer+android+auto+til+danmark
    • 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_off0000d353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
font_01_sfnt_off0000eb6a.bin
5a00bc1071b7fbb153b219b489e0ad3f0ef909878ee977e4e6405dd4c417c4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10752 bytes
font_02_sfnt_off00010393.bin
f0af4cbd5cd9c90f3672daa0ccea8c81c6ac770459dd7cdb9907a9a0ee2dfefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 17888 bytes

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