Malicious PDF — malware analysis report

Static analysis result for SHA-256 69eb882c454acfff…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 21:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9117bbe6367fee0ffcb25ea183e15d SHA-1: 7f354af5f04b202bd4e8da3f7b4e877764b2033b SHA-256: 69eb882c454acfffc11b0971114e5af7f807c1c65041a510711a9c74f0ae1827
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://ketchas.ru/uplcv?utm_term=shape+of+drum+in+maths
    • http://clairvoyantinfotech.com/demo/images/rurebodagikewodibag.pdf
    • https://sportnazona.bg/f/uploads/files/91719577288.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/pasodef.pdf
    • https://olamare.com/img/uploaded/file/fuliximozewas.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nuzusemutufeso.pdf
    • https://kaplaitalia.it/userfiles/files/bokoragamukefaxus.pdf
    • https://magnanelli.com/userfiles/file/87500454490.pdf
    • https://receptabc.hu/images_banner/files/sugivasiliderotijoje.pdf
    • https://searchkar.com/ci/userfiles/files/33610356095.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b9f156e5---xozusuwasiji.pdf
    • https://beldapin.com/calisma2/files/uploads/pigixeduvopiri.pdf
    • http://aryajob.com/user_upload/file/35736328102.pdf
    • http://tongkhomica.com/upload/files/vonomopip.pdf
    • http://teranor.com/ckfinder/userfiles/files/37488970396.pdf
    • https://edubox.mn/uploads/users/0/files/61126181091.pdf
    • https://smgbid.com/ckfinder_userfiles/files/67730122234.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/73655761625.pdf
    • http://master-br.ru/img/file/gexekozodurixiwodiras.pdf
    • https://nitdgp.ac.in/uploads/userfiles/files/37545834987.pdf
    • http://sino-web.net/filespath/files/20210907222305.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wovokeg.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/19204545704.pdf
    • http://escrima-rlp.de/userfiles/file/44115799465.pdf
    • http://emeat.ru/var/files/dinidasisotufifasob.pdf
    • http://euroambulans.pl/userfiles/file/72189761433.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_off0000cbfa.bin
bb0fa475e86e00cb0d334ac79a92efcacdb93d8f313015247cb0c939df46702e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 10892 bytes
font_01_sfnt_off0000e4fb.bin
88714790cbdafbd2d5c075e744dcf766638daf42973705b73f719054b7ffef1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 17892 bytes
font_02_sfnt_off00011329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes

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