Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0e9129855d628c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 07:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 589ad3232f944b85e2312f74b3fa6a98 SHA-1: af0faeba86650ff8ddb30e394bf1ca73daf661a4 SHA-256: ab0e9129855d628cd951b100d25ba735af0182e04340d0be4625bb066b4990a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=past+continuous+explanation+pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/suxapavigarevomavej.pdf
    • http://le383.com/uploads/files/93538624038.pdf
    • https://literie-depot.fr/UserFiles/file/44929333682.pdf
    • http://dmkaudit.sk/101/upload/file/mebaxitesaninumalegizudib.pdf
    • https://sofahatinh.com/upload/files/papabovonikoxivog.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/15471259711.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/zatabewu.pdf
    • http://eyupsifalibitkiler.com/resimler/files/nelazega.pdf
    • http://klusjesindex.nl/images/uploads/17090565052.pdf
    • http://nepalbestcargo.com/userfiles/file/jasabenojitelebexuret.pdf
    • http://hfnhsw.com/upload/files/roxokilorefabuwilufefos.pdf
    • http://gaudi.tw/upload/files/44248876037.pdf
    • https://namphuctourist.com/userfiles/file/6215431066.pdf
    • https://grup-insaat.com/userfiles/file/mifofawidowuxomuke.pdf
    • http://ecilingirler.com/resimler/files/49875899530.pdf
    • http://utcsp2.rustyramone.com/uploads/files/jujafivitijosakolibew.pdf
    • http://sabancilojistik.com/userfiles/file/14469160969.pdf
    • http://redactron.com/userfiles/file/nakixo.pdf
    • http://sql110.com/pic/jofuwosuvubigokusabezeku.pdf
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/97400485408.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/76018284510.pdf
    • http://ck-buhgalter.ru/userfiles/file/16689802484.pdf
    • 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_off0000cee6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 16792 bytes
font_01_sfnt_off0000e6f8.bin
9e6057984bbe1ed896d995648670ed7363be43a42574d3055793df04c4575092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 17548 bytes
font_02_sfnt_off000113fa.bin
aef389349e7406429f42e4965f34c0bcae783a17cc05f1ecd4c86f34288836da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10716 bytes

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