Malicious PDF — malware analysis report

Static analysis result for SHA-256 b712aad1dfcb6198…

MALICIOUS

PDF

68.5 KB Created: 2021-09-09 02:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d43ae143d35a8177c7002d50508b653e SHA-1: 32c0914abd1718041db811b6653ba4640635d501 SHA-256: b712aad1dfcb6198a4652e0934ae1e28713aed329f84b965447058e8b9e3ff5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/faf0f17b0dd09b394c1dad74e79738e7/daxovanolixosisolujukana.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/38241263077.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tagez.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nodixafikuxemodajizin.pdfIn PDF document text
    • https://isosklo.cz/uploads/pavufinixomodujim.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jutotat.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/71704694219.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wibiboxowenoda.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/96018914175.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/92786848620.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vajezedupudovibusekaf.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/81202069326.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/78578670485.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rebokabubuf.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/34193931175.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/80008977699.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/18813736397.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/89580139030.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/82558012621.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/mupusovikat.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/37168016308.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903222741748.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pixigegitorutixazujud.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rotopedafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=visible+light+regionPDF 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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 14572 bytes
SHA-256: 9a1ee87bf578a5bbfeade3ef410634def1eb07880e5d335b7f872aa2c338d725
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10336 bytes
SHA-256: f23fe93916ec1acd3000ea10e7bd68d33527b83924a97a3dc568174f84a5fe9a

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