Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e084623341d4e03…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 03:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe223b94833f2a62479d2d6fcb8e4b34 SHA-1: 7a93b52c4173c951d59d33cefc12ed02eb381b2e SHA-256: 8e084623341d4e037030b8fe91e4ffdc934c594b3ed139ae54b6bc35e98cabe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on disposable domains, likely to distribute malware or conduct phishing. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sherwoodchambergolf.org/ckfinder/userfiles/files/76113020472.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/wakikofoze.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/dizezefitomugeziragil.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/61177669955.pdfIn PDF document text
    • http://tid.vn/upload/files/gigekevemapezis.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/46a67202bd82c3d6431fb62ebe69d515/42920272811.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/felov.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64765074219.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b5f34468---komome.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/93806861598.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/wutetegudipemexize.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/70211295792.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/22486185607.pdfIn PDF document text
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/letesavifezuvem.pdfIn PDF document text
    • http://speckrepej.com/upload/file/83176283109.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/tamilenagifebiluguvuz.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/67704506141.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/tomigemixokusad.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/26549239674.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88503721477.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210905182300.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/ripavalunazirekupelukunox.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/42908384843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hero+wars+super+stickman+defense+hackPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 19552 bytes
SHA-256: 117b6300917fe9d0114bc7db0a0d7ff3793cf3bc076b749730e1f90335748b5c
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 11108 bytes
SHA-256: e9efa0f27fd08dbcc0dd4912d66cf10de3aded7e1dbc0d47499660c6442d3fc9