Malicious PDF — malware analysis report

Static analysis result for SHA-256 19641e71a847c2d0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2171f8f167bf6b0ddc0434526bc9613 SHA-1: d719521676ad09fa971f0f6d8dd7c8bb0b51143e SHA-256: 19641e71a847c2d0adafafbaf6fb377c9ef36606a710d38e7d544607264e22ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mayphotocopydogia.com/upload/files/jefivofidikizugupa.pdf
    • http://epwuae.com/userfiles/file/biligajefafosala.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/33204498004.pdf
    • http://badaranquehablar.com/userfiles/files/zazibelowojegufozuzate.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/22886824256.pdf
    • http://tangiahoang.vn/Images_upload/files/jezitifupodepelof.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322e890317b---69656886741.pdf
    • https://forexinc.ca/upload/editor/file/sajopalivapeze.pdf
    • http://bsbcarpet.com/userfiles/file/16280804720.pdf
    • http://chono.mn/uploads/userfiles/files/rodaterolopaga.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xesididejejifedon.pdf
    • http://gokea.org/upload/editor/files/55508463279.pdf
    • http://happinessgown.com/upload/users/files/29869397021.pdf
    • https://cubic.is/userfiles/file/fuvuletudaxebonag.pdf
    • http://hvezda-pardubice.cz/files/file/22457753555.pdf
    • https://ans5680.preneed91.com/upload/files/kajebokujalawexap.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/fasavorixiparuwi.pdf
    • http://cassotech.nl/site/data/ws/files/dipazegisarofipujedos.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/mojakuzezamaxopimizu.pdf
    • http://turhantur.com/turhantur/files/26758308577.pdf
    • https://intrigantka.ru/images/userfiles/file/3818488829.pdf
    • http://altelaw.com/uploads/image/file/pebafukuwesexule.pdf
    • http://seanmore.com/userData/board/file/76485505694.pdf
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/fobokoxit.pdf
    • http://belean.pl/userfiles/file/xibalil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+365+portal+login
    • 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_off0000d199.bin
0c377377ef4609173f6e8a57dfbe6645e4e3e05fceda04eb8f83860f5a28d84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 18052 bytes
font_01_sfnt_off0001006f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16792 bytes
font_02_sfnt_off00011886.bin
27078a6268aebdd4850d8927b25dde69c152d98aff961538906ae78dc00cbb3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10988 bytes

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