Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b0bd1818d0e3ee…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 20:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbc1a8c0152cba3e0bd11f481e48932a SHA-1: 02874c81edc7b6bf904eeb53249616380bd1dac8 SHA-256: d3b0bd1818d0e3eec4c0fa04ad533e2057c76992a5c5e605da04ac4231b1240c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to suspicious domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/sujefevamemokanazusub.pdf
    • https://travellifeafrica.com/ci/userfiles/files/73200764488.pdf
    • http://toshiteriyakiburien.com/uploads/files/40343362783.pdf
    • https://icoachyou.biz/images/ckeditor/files/dejifabef.pdf
    • http://standardamulet.com/files/files/rozozimimojasiwese.pdf
    • https://npkfertilizerproduction.com/d/files/80417787438.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6dfd43a5---69190214127.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/eri26ds2idtrtrbik1379oi73m/vegax.pdf
    • http://dblbtech.com/userfiles/file/pufupudovesid.pdf
    • https://daulte.ch/ckfinder/userfiles/files/robira.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/keradal.pdf
    • http://aldobini.it/userfiles/files/94118018905.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/rakipavuxakemaforizo.pdf
    • http://jinyudachem.com/upload/files/30963774691.pdf
    • http://cauthangdep24h.com/upload/files/27743895097.pdf
    • http://futimisdev.com/userfiles/file/vasurozonudaxilosetibo.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d690481ec---63312038303.pdf
    • https://telenovella-bg.com/files/49684572703.pdf
    • https://fzclicks.com/demo/files/editor/file/zegaratijagesadoxaso.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdf
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/5093021332.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=connect+phone+to+tv+using+bluetooth
    • 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_off0000c285.bin
e0269f969e6654ee2eda9f24c2f5b946e625762ee1fbb26976917accf6f37c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 17120 bytes
font_01_sfnt_off0000ee57.bin
5aae8978a4a07dfdb1e303f7b3c0ebd6931c6221e4cba90ec61620467a8961a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10728 bytes
font_02_sfnt_off000106bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes

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