Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdd22bc656bd46e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 07:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbfaca8b1b8749fd523af867f16a8d15 SHA-1: 2d9148801eb01cbf62f88501bb56ab63c001b87e SHA-256: 2bdd22bc656bd46effc19822e2e40d911e93745a1e430e5450319410ce40565a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating an attempt to obscure the final malicious destination. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=how+do+you+put+pictures+from+your+phone+to+your+computer PDF link annotation
    • https://ekoelprom.pl/public/images/editor/file/38445054852.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/vovekum.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/lutisisevujanufixewotet.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/51742461430.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fukolajujofe.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/43b6c6bqbafimvppvjkfu6p94d/pumetatalabune.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/69714004370.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/jumixutisufegiba.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/90256428575.pdfIn PDF document text
    • http://ccshecea.org/upload/files/xosaperedebopixon.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/80394845459.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/41197954152.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/54630187461.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/47311532540.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://myphamlulanjina.com/upload/files/65712924702.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/9305678314.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/82910922375.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/funikoxinapopeze.pdfIn PDF document text
    • https://andana.us/files/files/xowaxebinuxosugoli.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908201317745964.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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 10968 bytes
SHA-256: 39ed6221cd763aa6722f9f2fa5f09a67aae1b950075e5c9e1815be0ad97decd3
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16672 bytes
SHA-256: eed22f3b8f4805bffe57e065c27e574e4fc4e6f8789c0afe9a4d7183ccc222d2
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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