Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7061aea832314a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 19:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2344236ff7fa2f3f84cd38de2f9eb0 SHA-1: 483045477405b60fc5f604321e06c3150f8920d4 SHA-256: ac7061aea832314aef9924fdfdf0b9585be68c4aabbcfc67f934bef9eadbe55b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. Although no executable scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://actor-conseil.com/files/file/79640845121.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2c49bd581a34bbbf7e7c95877be75955/9419609820.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/dadobi.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/7299830319.pdf
    • https://paidionresearch.com/userfiles/files/kewilubim.pdf
    • http://yucehukuk.com/resimler/files/92781293154.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/60028526614.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354a56d9617---mawogoninisiwegituxasebe.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/55845187470.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/45628782381.pdf
    • http://www.terresdescaraibes.fr/file/gelelaxeze.pdf
    • http://magendans.com/imagefiles/file/dowerumaju.pdf
    • https://adminico.nl/userfiles/file/46081603566.pdf
    • https://nepalfinepashmina.com/userfiles/file/gogupovat.pdf
    • http://stillincontact.com/images/mails/file/29229062997.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/19487274323.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/vifolojetegakesitumetotip.pdf
    • http://ekosertifikat.uznature.uz/userfiles/file/91769842657.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/84170066168.pdf
    • https://coil.hk/upload/files/62103117843.pdf
    • http://cupta.org/userfiles/files/20210904070341.pdf
    • https://usgcambodia.com/userfiles/file/xafepuxola.pdf
    • http://connect-senior.ch/uploades/userfiles/file/rolasanejogububelebuxavo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=history+of+the+android+operating+system
    • 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_off0000b20c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
font_01_sfnt_off0000ca23.bin
48edf6f402901f3502197ea9c48559f8340578ea05cd0216802c0d8643bd26bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 11004 bytes
font_02_sfnt_off0000e350.bin
9954c7559f94fb163b3a839991228b52c7350f76e9bcf2cea9b3def989f0b6d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17164 bytes

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