Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b5d660560d7163…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 07:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4b4a9f8e1df2a0c2b65dcf3627a8aa1 SHA-1: 90c81066c9bbb7de236e07451b7353823b032a6a SHA-256: b9b5d660560d7163cf9dcf3bfa9bad4e8389c5620fc3d2ffa888afd4d52bd3a4
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on disposable domains, indicating a link farm or redirection strategy. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation for client execution, likely involving a malicious JavaScript payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=123movies+shrek+3 PDF link annotation
    • http://ilovehikari.com/uploads/files/tezosedogitiwikonenuse.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386469e76d8---36560606071.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/genorilonori.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/90384930424.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/xolesire.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/90634807163.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/12075101964.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jujawafowu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/61382285092.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/puwel.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kupukebazelejozijizumi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/37370538758.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/rovire.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pubigifezane.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/madavazanogugad.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l6o14a6oop0shombsq8v2v91o0/47144412827.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/sugoluduzig.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/57415303215.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/72954861057.pdfIn PDF document text
    • http://contua.org/userfiles/file/wizatekananofepegi.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/44922167070.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/dazanatedugarinimujal.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 18640 bytes
SHA-256: 80e19d93cfd6953ebce5b58ad9387b86471d8d01d6eca962ca5144b2e3fbb25c
font_01_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10368 bytes
SHA-256: cf0092503fb32ecbcec8f7df9f5ce3203f6330cbc001d1f5934b38dc7cfd0c37

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