Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdf87c21044d292…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 13:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cb2e36e7fb6ca0decbe5c15f0ac5751 SHA-1: ba903fc96a85babf327831b93b3e91e8a8a228d1 SHA-256: 0cdf87c21044d292eb5e4c025ee64898edb18e92f16a478ac81c7d8a4cc93bc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=best+video+calling+app+for+android+and+iphone PDF link annotation
    • http://phuvuongcorp.com/luutru/files/wogivemo.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/50493038235.pdfIn PDF document text
    • http://rts-3.ru/upload/files/23982682229.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/60115926352.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/nutumutumulijowasuno.pdfIn PDF document text
    • http://pbpharm.com/upload/files/jabolowisowu.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zuzosukowivupuzezogurawe.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/77329770772.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/90679665687.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wupufa.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/lufimuf.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/88163882453.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/30809519057.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/sumitig.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/33975876241.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372640d13a3---47464475309.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a54865638788e483df458cc5be64653c/wigetigalakazafubowidarin.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/82459827790.pdfIn PDF document text
    • http://philboyd.com/46111359470.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/labetemanizete.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/21150679696.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.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_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 17220 bytes
SHA-256: 2179c29f6d44381ab8b214c8b039f4ee17c8f27bb5d70ccde772033730a7f4d8
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 11016 bytes
SHA-256: 866c6edfd011e18f04b522e6c4964df05685607718091d51c7c00bb28c048857
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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