Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fe619387c8fdd9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 21:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d167e1e85ee188459c0e8a352854b977 SHA-1: 4e1ccd9bfe2952b1375b760ee5158c927d43cbeb SHA-256: 42fe619387c8fdd9901b5b441b54f387e72930dc046ad3428a508270032b22d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of many unknown-reputation URLs further supports this, as they are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=scientific+notation+answer+key
    • https://daynexweb.com/upload/ckfinder/files/wurijanixiwepimesikan.pdf
    • http://palaciodelosnavas.com/userfiles/file/wilojenaze.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/zuserejekazinoxemij.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/towawuwakavigez.pdf
    • http://ldkxzzs.com/images/userfiles/file/73445943851.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1199eb265---50270252915.pdf
    • https://tonthephunglan.vn/upload/files/93159666807.pdf
    • http://simonide.org/userfiles/file/15177098179.pdf
    • http://h04ydivan.ru/userfiles/file/sudanelewiza.pdf
    • https://hotelmitrutarija.com/uploaded/files/35764499108.pdf
    • http://bora.su/ckfinder/userfiles/files/59224379387.pdf
    • http://officinedesign.it/userfiles/files/25117824021.pdf
    • http://sumosushingrill.com/uploads/files/75002689407.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/8128936587.pdf
    • http://cisseo.net/userfiles/files/49994418741.pdf
    • http://jiehuist.com/userfiles/files/surebokudopomaxagesumi.pdf
    • https://giverny-bkk.com/upload/files/malufisijomutotapivi.pdf
    • http://rnralpha.cz/res/file/60080437258.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/39094283088.pdf
    • https://mimzyonline.com/userfiles/file/sotudedetezoteru.pdf
    • https://cambodiadriverservice.com/userfiles/file/19884436411.pdf
    • http://bctlorraine.org/userfiles/file/46789171571.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/23797808842.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c353.bin
1ca5a58e79d5ddb80b4850cc1effe945f5dc26e3b3ac5d6061514226fc9cf720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 10652 bytes
font_01_sfnt_off0000dbf5.bin
0b2fd629ef2c3d94cb0960b6b3d9b763919107c98a7f655140bcf9b701dcc20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16288 bytes
font_02_sfnt_off00010642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 16792 bytes

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