Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7302822a218ced…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 09:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bda0536dee590af61ebfabc2eead23d SHA-1: b574e503b8a82de600c5d3a34e6a36f7250019c4 SHA-256: 8b7302822a218ced3600b72e84b5fb2617375a7adb59596663ff83667b08cd3b
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous links pointing to other PDFs, suggesting a phishing or malware distribution scheme. The presence of a 'download' lure further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huaku3c.tw/uploads/files/202109140342306040.pdf
    • http://dentali.cz/files/files/fogeletepoguvoxenex.pdf
    • http://kartinatv.org/uploads/files/pesexugitezebuto.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210910_B57905B0A909FFAC.pdf
    • https://tekmaker.com/upload/files/47045060308.pdf
    • http://terralis.net/catalogue_dynamique/file/rakozazep.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/21911089285.pdf
    • https://miltonmattox.com/userfiles/file/3456880359.pdf
    • http://jjw-led.com/userfiles/file/17907909246.pdf
    • http://mientrungland.net/uploads/image/files/lufopugijagibilurafeku.pdf
    • https://giaynangchieucao.com/userfiles/file/fovopexekudanevunegokug.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/wosuvuretalirexuxevevos.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/26500242688.pdf
    • http://www.findvoters.com/userfiles/file/xubufiva.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/mopozevenedetakoxolavam.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/75008050368.pdf
    • http://yigang-lin.com/uploads/files/202109131850557188.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/16613497671.pdf
    • http://pk-rowery.pl/user_pict/file/banetode.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/22867642917.pdf
    • http://hzaidele.com/images/upload/File/zifitisasofon.pdf
    • http://bippex.com/filespath/files/20210911120117.pdf
    • http://centromp.it/userfiles/files/nezizujemonadolujamuxaru.pdf
    • https://coffeetuanvang.com/Images_upload/files/bumekejuvugul.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/jadudamidowujegufudu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sultan+full+movie+for+download
    • 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_off0000de3c.bin
ce73d04a001374cdb5f3958bd1bec94732cb6aed13c9cbe5ca19dfaafdd4b437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 17692 bytes
font_01_sfnt_off00010b8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 16792 bytes
font_02_sfnt_off000123a2.bin
470aa455294b114c6bf2d2a3f64d7d24bd08179db9e9ad50eed7ee0a358624e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 10672 bytes

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