Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a20a53d54b36b5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e40f7b6a32fe83cb763088d92372392 SHA-1: 716f41500161ec8258b885099f99d400e7969cd5 SHA-256: a3a20a53d54b36b5b2e4e0b3d09e9099cb9ae5131317e65ad96b4b5fa155611b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to facilitate phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://vlajamo.cz/images/file/63617216751.pdf In PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/88901187967.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/xotomisefuz.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/56022450477.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/mikadiboverukobupavitizo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161364177d37ae---8542064417.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/ninabakenok.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/24094027074.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/ruwakumojuzuluzigo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75992935200.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c136190ca---71797704399.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/45636227421.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lezokib.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tezivev.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/65870879031.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/rixiwupaved.pdfIn PDF document text
    • https://hotelcorona.ro/files/tugilaxuwabib.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/vunumonafojubawowubugilo.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/44122920936.pdfIn PDF document text
    • https://digireg.es/upload/bovulapinomu.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/25326480677.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kerisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lamhe+full+movie+sridevi+anil+kapoor+hd+mp4PDF 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_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 20832 bytes
SHA-256: f9bc43dd49d403e09c08883a90c718660ca0d59e5bdca73c668d16886c3541a9
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10960 bytes
SHA-256: ed907cd21fc585664ad8034feb45f071c193c75a63921f0d0facb82e8ef690ff
font_02_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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