Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bc508eaa482319…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 02:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d4d9d310350d9aa9ed6b6072681b25b SHA-1: 76cc29892945e1bc1302f1ee9febe01635383854 SHA-256: c0bc508eaa482319ba18efb72ffc76cf891c8c5f6ec8a9ede48a64e7eba0fb01
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which are algorithmically generated and hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tabouligrill.com/ckfinder/userfiles/files/53558541672.pdf In PDF document text
    • http://casier-a-bouteilles.fr/file/10198405321.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61359050119.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/luriwexujevamuru.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/jozoxebabutitetegujul.pdfIn PDF document text
    • http://nfc.soo.jp/file/14395522968.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/33771784644.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/wosimibofujemonu.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gilenipanugowokajijida.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/liwagatamifuja.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zakoluwevafogenumumexizof.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/guxomiwi.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/97145912525.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/vukagugaboged.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/weralumusorimevenagar.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pujukolutiro.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bf36d479be3aa882218d091aba42f2da/69658601397.pdfIn PDF document text
    • http://turnyras.lt/Files/file/71373386322.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/86676457379.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/93519382622.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/33027862502.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340d93a5829---gobuguravomelizatutimoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=doom+full+apkPDF 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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 18272 bytes
SHA-256: b482b414c12826a1a7b90f84b1391b5a27685510b2d74fc06fa4185fc8709834
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 10016 bytes
SHA-256: ab1b5b412031b988d44995baa83e5c2f33bfac013238caca2dcb7e8eefa13e10
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1