Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ca03c6fbcc7838…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 18:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53ee4e86c3878ba953e815a0ca6f563c SHA-1: f073f4b0f95d6cf047e448623152acb2a072c90a SHA-256: 66ca03c6fbcc78382b18430e61b42c7dfedead548003ea24b15d115f1e56e481
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF's structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=best+file+transfer+app+for+pc+to+android
    • http://huiking.cn/uploads/file/171503119601.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/17558965573.pdf
    • http://hakasasi.id/userfiles/file/82313338193.pdf
    • https://trystsalonri.com/images/file/54937040029.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/74288710723.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/61896360950.pdf
    • http://www.s-prom.si/fileupload/file/90085504029.pdf
    • https://dusunceokulu.net/resimler/files/rukezotatase.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/3659493173.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdf
    • https://nasikampung.info/contents/files/14742120389.pdf
    • http://madmojo.com/fckupload/file/64765074219.pdf
    • https://jmtours.co/aym_image/files/24198243142.pdf
    • https://mjrspot.com/fckimages/file/miwisodevonasu.pdf
    • http://ecohort.com/userfiles/files/bibowobavuxipej.pdf
    • http://dentalcenterstudio.it/userfiles/files/73534501326.pdf
    • https://anyimaker.com/upload/users/files/lexebore.pdf
    • http://lighthouse-connection.at/myPix/file/nelolume.pdf
    • http://grupophi.es/uploads/files/89937713994.pdf
    • http://njxinbell.com/upload/files/27608698667.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/9215301833.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_off0000cee6.bin
f9f5f5b434cea42ca70cdbb4030cc86dfb2f43ba94617321b0ff0ec96eb7fd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 10668 bytes
font_01_sfnt_off0000e774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
font_02_sfnt_off0000ff86.bin
fcae591ccda95e9fdc6f92792358acffe001c7881f208448bd71c8fbe022ad87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 17432 bytes

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