Malicious PDF — malware analysis report

Static analysis result for SHA-256 14977dd3e6158895…

MALICIOUS

PDF

84.0 KB Created: 2021-02-20 13:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 57a6a3643ac03beda015c296e9429852 SHA-1: e291bb652e6344da1222373f3a3aba073450f689 SHA-256: 14977dd3e6158895104b39234bdaf59382dc33bcd5d197f233e3964ac4e62696
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=algebra+lineal+matriz+inversa PDF link annotation
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/sudirixeraputebegos.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/46056b.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/7131598.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/5090804.pdfIn PDF document text
    • http://fofafik.iblogger.org/social_media_apps_java.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/216147.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/9206913.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/646188e839a8.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/sosipesiduxolaxa.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/398713.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/8602867.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/4404806.pdfIn PDF document text
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/13e0e1d0e.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/5de1afb63aa.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/kajet.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/bizixeserodarul.pdfIn PDF document text
    • https://naxofezuwu.weebly.com/uploads/1/3/5/3/135396878/pulan.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/fepago-nadikupekifare-gadedux-mozomarukago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisuzes.epizy.com/brocade_network_advisor_san_user_manual.pdfIn PDF document text
    • http://zunedolu.rf.gd/safevenop.pdfIn PDF document text
    • http://liruvumud.rf.gd/fozupudemanowel.pdfIn PDF document text
    • http://kitalanexu.epizy.com/91057876858.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 5244 bytes
SHA-256: 5bb22a614a89c302fa628a7574f902a23f1fea2e020dd6c30b4dd22da530b743
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 11372 bytes
SHA-256: 18e5133fdfcf73e01d4b9ab72652b28af2d39256f40ea4fbc6bab7126b85ea67
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16428 bytes
SHA-256: 14984a54b1c7030ed39090f943621fe3e0d8eb96a55c28a02774a1e0affb3113