Malicious PDF — malware analysis report

Static analysis result for SHA-256 325431948d8b8090…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 10:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab95914716556c6b62eb3eaf403ca907 SHA-1: 2e6f4a8a58cebcb6aee2a25be127938783328032 SHA-256: 325431948d8b8090eec25753297b9e93f187b8f4aac86e2d18683e0f9f6846d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=zenonia+3+apk+download
    • http://technoprofile.ru/userfiles/file/65009643642.pdf
    • http://alnadaoil.com/userfiles/file/28900811513.pdf
    • http://beautybybelief.com/admin/images/file/23401737671.pdf
    • https://tranthachcaodanang.com/uploads/image/files/82938419652.pdf
    • http://giorgimpianti.com/userfiles/file/kuvaxepoxakosuxapup.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/mijewipogodizij.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/80725962725.pdf
    • http://2m-m.eu/userfiles/files/35141307239.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/91993944119.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/38804511813.pdf
    • http://jogagongu.pl/userfiles/file/namefafogesavesafenago.pdf
    • http://www.srijonihealinghome.com/fckimages/file/54544878513.pdf
    • https://ceccardolj.ro/userfiles/file/pavavowivomodidisekato.pdf
    • http://amsasecretariat.fr/userfiles/file/nirabodusugitit.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/92812943104.pdf
    • http://vervesimuhub.com/userfiles/file/58349247841.pdf
    • http://trunglamdecor.com/uploads/userfiles/file/didasufixumafanupuju.pdf
    • http://amandamaitland.com/images/file/kepenu.pdf
    • http://cheumst.com/upload/fckeditor/file/pajolinolemopezopojukuf.pdf
    • http://www.mostenpo.jp/userfiles/files/molufuwixepakapavudavut.pdf
    • http://www.klimavill.com/data/editorfile/viwipivepuwo.pdf
    • https://indicaperu.com/userfiles/file/68758520460.pdf
    • http://orlickachata.cz/files/files/mafapevenamurotowip.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/23368985079.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_off0000d861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16792 bytes
font_01_sfnt_off0000f073.bin
de754f1d0eb81ebbffb0f6976a3ca52e85c2705934a33c5ee255d97d59e1bd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 19852 bytes
font_02_sfnt_off00012453.bin
1b44b72e945f0cd4ce9662d674d300c4b7d30192f34ec58dbbb5f342d7e0b3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 10332 bytes

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