Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0f4264ee2b54ea…

MALICIOUS

PDF

80.7 KB Created: 2021-10-08 16:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 365e2439a4e1d15fe968be4dc36b16f2 SHA-1: 0e070071516d85efbfd140401881e4f285c7ed01 SHA-256: 8a0f4264ee2b54eafa51bd80f8624d753490e790c1e48655b59bf47e246f4390
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for hosting and distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_RANDOM_URL_LINK heuristic specifically points to a link designed to download a secondary PDF payload, likely containing further malicious 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://biswasi.com/userfiles/files/xufugus.pdf In PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/kitunodezosevewigaton.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/36516687564.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/70384817100.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/zosokepalotepune.pdfIn PDF document text
    • https://chilepools.com/contents/files/putuzigote.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/66848303583.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/39568802588.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/bejopenel.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jevexoko.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/gozakojomozevijuvupavisi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/89432292162.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/biwesezojemewag.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/24259916191.pdfIn PDF document text
    • http://goldengatetaichiqigong.com/userfiles/file/1867822535.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109150703177645.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/90342652620.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/21828815992.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/nerifezudenulepikowupi.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202110060253119747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+wash+a+wool+blanket+in+the+washing+machinePDF 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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 17712 bytes
SHA-256: a6fd52fc9f59399c351e10a2c0f375685a8ab7c192243692a36660062ae68958
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10888 bytes
SHA-256: 654c569a06fa65894c48a4d7e51beb6acd5277cb6a48cb21422cb2f02953c8c9
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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