Malicious PDF — malware analysis report

Static analysis result for SHA-256 d551e125a91ffe18…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 06:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b39c04f204376c0bc7804f3a7f5e1a3 SHA-1: 28afa2ef39a7de52dbdb324130672716cb7eaa33 SHA-256: d551e125a91ffe1824717e449a76020b7ee415eec8965c5e88e64fbb06e0ef0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential lure.

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 http://thebankcardservices.com/uploads/files/59076734117.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/pelevof.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/poradadawejofizelawitawor.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/masibivokure.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/80048327651.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/81315759575.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/56838880782.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/wuxizuxorakofupurule.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc8cc9c97---56714896314.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/68444473946.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/sodusa.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/87350885457.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/zuxaruzix.pdfIn PDF document text
    • http://headrepublic.pl/images/files/35896385679.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/29367746062.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/83021816983.pdfIn PDF document text
    • https://bunianco.com/other_files/File/vebopisuvamaxo.pdfIn PDF document text
    • https://kulittelor.com/contents/files/13470872223.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/72178783000.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/70992170339.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/loluxafoluwigelovadipek.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=missing+bae+quotesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10516 bytes
SHA-256: 410d83bf486c00320c7f2a4821eb0dd9187754d538cbdbaa9f32a217cca64a80
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 17952 bytes
SHA-256: 8ecdbbadcf0669d333a1328a492c7dcbacbf4109ae6f4926b304d3339ae74bdb

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