Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b1598e66db327…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 19:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b842d667dab54ce0169b56d60b02a777 SHA-1: 976c99e6bb2bcc898526a1d0746f94d99fd2b267 SHA-256: 8b5b1598e66db327ee880f8a476d517288cec959bbe0000168fdd438eb6aa099
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many on disposable hosting and employing UTM parameters, indicates a link farm designed to redirect users. The ML classifier output of 0.998 further supports its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=indoasis+app+apk PDF link annotation
    • https://alaqart.atelierleuthold.ch/userfiles/files/94785889572.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/27146997813.pdfIn PDF document text
    • http://eichler-kammerer.de/44950147542.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/nosoli.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210909083707.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/20621072865.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/81927142906.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613612dbda407---77431453691.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/6447255065.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146519421d90---19389474219.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/luwaguxidurisiwejunama.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/vaxoniredapa.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ziwikadofixi.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/gifozugij.pdfIn PDF document text
    • https://matratva.in/userfiles/file/rowomumuvezirazo.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bozif.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zelarerog.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/damozesojifixozowalinet.pdfIn PDF document text
    • http://quinta.cl/upload/files/kovemavufanokunijitikivux.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/98935472328.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/10192922366.pdfIn PDF document text
    • 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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10052 bytes
SHA-256: 2680de486bbe4ecb5ab99651e4a2e9443ccc50951f8d7964e24e2df6ab1e60da
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 18708 bytes
SHA-256: 46d5214254213f8ae35fc0c384a4dbc5c9bab56cfe13657b6025bf7a64e67614
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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