Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb623b676a6fad3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 19:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a35901c6b7763d9152e22a2de2ba1795 SHA-1: 57caaadf22d4c17230561916adda93cfdaf58736 SHA-256: beb623b676a6fad3e0a85594e5de0a3d7c1aea9b4ca7c10c1c1fc970b282efb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable domains, suggesting a tactic to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of the links and the ML detection point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nagyberki.hu/sites/default/files/fck_uploads/file/11559752418.pdf In PDF document text
    • http://tomgiongvip.com/uploads/files/file/64899594164.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fuvatidutafurovipiger.pdfIn PDF document text
    • http://eichler-kammerer.de/kogomag.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/64279814981.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210910_184914.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090110535976.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/76178392879.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/susoxifuvovalu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/niruleromugezazarexe.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vunexulazoji.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/7475246985.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/disutipuxabupu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1l04mme5od179kajl346g1bgl2/dupuxiw.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kuputivaz.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/degoreleme.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/zejaxuvokukelulemimus.pdfIn PDF document text
    • https://spacio.hk/attachment/file/23370333126.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/41128854840.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tipol.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kipepipu.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210914162053247.pdfIn PDF document text
    • http://chemsdano.com/upload/files/82023874215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+intro+maker+for+youtube+androidPDF 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 17132 bytes
SHA-256: 914c064316d9d395f90f47dee7b80aeab08b0ef72bcc6078fabb31f9c1120633
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10968 bytes
SHA-256: ad7da025fb5f296b2cc00fcb0fcc48a9e593ddb079b55dd49e8530e664795a97
font_02_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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