Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3083be960218118…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 13:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 029a623e5f46acc2dbf8f8c04c54fb21 SHA-1: aeaf4cf9ebb424eb2e344fdbaf933c9937f380ee SHA-256: b3083be960218118d3652603725e118911b66b8079e4f6a89c3f2f16fd533d6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://harissarantis.com/userfiles/files/regeriso.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a66f54ca4---49583491096.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jejuj.pdf
    • http://bandenplaats.nl/cmsimages/file/wadebiku.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/68079942732.pdf
    • http://www.peretprod.ro/content-images/file/sebujovagawewubezebega.pdf
    • http://digitalpolicycouncil.org/imagenes/file/66439345919.pdf
    • http://yourhandmadeitems.com/userfiles/file/26778332610.pdf
    • https://jakspravnenapsa.cz/userfiles/file/tidozu.pdf
    • http://jobsmarttampabay.com/files/public/3909590303.pdf
    • https://dortmundpools.com/contents/files/78705864057.pdf
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40345015752.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/59257922171.pdf
    • http://kool-house.com/upload/editor/file/61223811482.pdf
    • http://maroba-zirndorf.de/file/75764296884.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/13520893419.pdf
    • http://gyermekhaz.hu/Content/site_images/files/45998445192.pdf
    • http://chinatriage.com/ckfinder/userfiles/files/70285336391.pdf
    • https://telechips.com/ckfinder/userfiles/files/bexonojigikufafajiver.pdf
    • http://www.gobarging.com/uploads/textareas/file/85061043908.pdf
    • https://vienhung.com/webroot/img/files/sojusisagurawujeboduji.pdf
    • http://aylabawadi.ae/userfiles/file/zeluf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=link+to+download+play+store+app
    • 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_off0000d956.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
font_01_sfnt_off0000f16d.bin
0b4f4ffab122b8049ec14a0901b83928a33b7cfaf5e51bbb86391be535150c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10632 bytes
font_02_sfnt_off000109f0.bin
b9a5010a15f3403893b84bf29c3fe165694a45b04747b8046d1a1e2cfb170990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 17432 bytes

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