Malicious PDF — malware analysis report

Static analysis result for SHA-256 2060b5f04b6d1c68…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 09:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a36f17371113ac63a16e5f37f4615a30 SHA-1: f66b008984db6853a0148809ae121cdaa1e3c746 SHA-256: 2060b5f04b6d1c6872aea7f9f8fe6cee2172e3fd0a9e9616389da835d3586c71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious content. The presence of many distinct hosts with single links suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://villacappuccina.com/userfiles/files/27726854937.pdf In PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/12217258636.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/nenuvuko.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/92396219366.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/jeruxubo.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/62344549068.pdfIn PDF document text
    • http://rhondachem.com/d/files/tuvumazeba.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/27413881167.pdfIn PDF document text
    • http://electric-kernbichler.at/70630906274.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lisagibutedat.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/68401346435.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/30294071959.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/25763790734.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/lusumatulokowozukasafa.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tizafizunof.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/rakixemosax.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/lugozitazifedojezatot.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/36165183463.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3d4b317167c66fcd74e38566e7bb5bd1/tasudalevav.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/paboji.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139061062b03---67245091732.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907064436300719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dead+island+2PDF 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_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10044 bytes
SHA-256: 4094e9d9bb363857f52cf68ec689a20f44a4450e0de3b5a25fe89b238a7c9bb1
font_02_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16736 bytes
SHA-256: f92d95a10c625f09e0b7a1237ace7aaca6e7d6fed5040004b655977280fcc7aa

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