Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f39a181ae40fe56…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 17:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b34a4e49291e9e18f9c78d5c616f0160 SHA-1: c54ee8869cfa97c4f3fba9150f2a28b94c1c98a1 SHA-256: 2f39a181ae40fe56706f00480ab4260097a21e0b4ee72c6cc29893614b44cc19
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 identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=ultima+version+de+tomtom+para+android PDF link annotation
    • http://siripanyalamphun.com/user_img/files/34197533037.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/jupodamasivifagip.pdfIn PDF document text
    • https://506hlapeta.com/files/file/21884807603.pdfIn PDF document text
    • http://selidbe-beograd.info/files/tolenaz.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/rupusejox.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/fefejorozituzesuni.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/11819238996.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/betuxorami.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/99d91baa73a7a9459d87800378c0f5a9/waravemupimukawi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613317eea0e1b---bopepi.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210915_376DFCEA3103883F.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gebuzetotul.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912064750361529.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fifeveg.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/8571937397.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/20288601960.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/34317101702.pdfIn PDF document text
    • https://sim2007.com/files/defudojiwa.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/boxas.pdfIn PDF document text
    • https://shidoremicrosys.com/media/kapavewimemopebudi.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68928723246.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/bugizefope.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/2161726958.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/ralukarosiwase.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/51369862116.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/53527595789.pdfIn PDF document text
    • 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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10628 bytes
SHA-256: e90a19cd7fbc871d28c5cdef2deeef5f280f7fa70e13514868088b2c57e1a4eb
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 19032 bytes
SHA-256: 4bd76badac71bfb3ed77af2c0fec3b55028ddb4b087f876eb51b0928167a4838