Malicious PDF — malware analysis report

Static analysis result for SHA-256 84653341ebab1203…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 17:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2cbd817ca6183b09ca029d658c6240e SHA-1: e2ca5f5471a5796f128c4602efc9362111468e23 SHA-256: 84653341ebab12030b8617e74090abdb07db13e47eb12fdc9abbe5cb403d6c4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous domains, one of which is hosted on potentially disposable infrastructure. The embedded URLs and the PDF structure suggest an attempt to obfuscate the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cambodiaangkorhomestay.com/userfiles/file/fawop.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9dc3f8f4---13558280911.pdf
    • https://yuvasarkar.org/userfiles/file/fotom.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/15212192132.pdf
    • https://wanna-drive.nl/files/File/79951639682.pdf
    • http://www.bash.cl/media/file/luragokaluroforazopezone.pdf
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdf
    • http://fsoa.cn/userfiles/file/69215056642.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/matexazufugezufekobonore.pdf
    • http://karlsbach.de/userfiles/files/16024194186.pdf
    • http://konsultacjenaukowe.eu/Upload/file/vunalulaken.pdf
    • https://dialogueinpraxis.net/files/docs/mavutotegoduxipuvekibafet.pdf
    • http://dienvietbac.com/uploads/files/ruligekujawitefumiwovuse.pdf
    • http://compow.net/ckfinder/userfiles/files/vigonugijijuzedasewil.pdf
    • http://foxhill101.com/userimages/68018042577.pdf
    • https://efsanepin.com/calisma2/files/uploads/81781878257.pdf
    • http://langeline.com/ckeditor/upload/files/23446382399.pdf
    • https://lazeo.nl/userfiles/file/punularasatamokazela.pdf
    • http://lixupeng.com/uploads/files/3556402253.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ccebac974eca5134c337d6e426ce4c6b/79174741119.pdf
    • http://baigeleather.com/userfiles/file/43219658418.pdf
    • http://doingthing.com/downloads/blog/geust/files/31683927503.pdf
    • http://photonart.nl/phpcmsys/file/nomezonogapaz.pdf
    • http://cpghollywood.com/userfiles/files/tamofuzu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+increase+volume+airpods+android
    • 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_off0000da5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16792 bytes
font_01_sfnt_off0000f271.bin
d608b994cbd7334972cc303fe75bf5c46e255ccc316886f97263e4ee9138eb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 17608 bytes
font_02_sfnt_off0001200e.bin
0006b0c50f1e75913666a188fc3ce97dbb58a76b3e97929b358428328d63dfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 10916 bytes

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