Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a839a322fee9d8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 17:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b5de7d7dae57bc0f218f54de18b74e1 SHA-1: ff7389118bb9a46fb29f67575a50071fd4661171 SHA-256: 97a839a322fee9d8e3015150bb7e1d51bcafc3cd8ba2bd0919503a81030969f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, with one explicitly identified as a disposable hosting link. The presence of many embedded URLs suggests an attempt to redirect the user to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gtlitalia.com/userfiles/files/zilotokulu.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210924_7F9A9C05039D096B.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef5edced---balaxanimofipigixinadovos.pdf
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/sipunawobagijubuxudedu.pdf
    • http://strandedtattoo.com/file/wawagejud.pdf
    • http://acmemask.com/upfiles/editor/files/73050522186.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/75216620503.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/junaseb.pdf
    • http://recko.ru/ckfinder/userfiles/files/jowobujumoras.pdf
    • https://sgcaregiver.org/contents/files/28186184087.pdf
    • http://ramenhajimetustin.com/uploads/files/bufela.pdf
    • http://hitecds.com/userfiles/file/1742490668.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413069d1c5f---susubet.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/rineromu.pdf
    • http://nwatchonline.net/userfiles/file/pegizeruwufewok.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/mitowazojubav.pdf
    • https://resulgame.com/calisma2/files/uploads/10974216862.pdf
    • http://aaykpn.com/uploads/editor/files/1571759132.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/800842291.pdf
    • http://hainescentreasia.com/images/file/86698023782.pdf
    • http://al-bandak.com/userfiles/file/70622873714.pdf
    • http://n2nlah.org/UserFiles/file/kovasadojesa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fast+pirate+proxy+list
    • 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_off0000afee.bin
28b86757cc63ad5e126c679b4cb804a1777fc90a1646b5a0546b6d2ade798f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 10336 bytes
font_01_sfnt_off0000c766.bin
e6b7c94d1499841e8051d7073b462a5f09f733cb835d6249fa8066c560d6a4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 15892 bytes
font_02_sfnt_off0000f02e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16792 bytes

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