Malicious PDF — malware analysis report

Static analysis result for SHA-256 6481983da74218ef…

MALICIOUS

PDF

74.2 KB Created: 2021-05-12 18:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8804dc2543a393377d26d1e27eb3af SHA-1: b667ab2805d49862edefe1c01a0855afa64f407a SHA-256: 6481983da74218ef36007432166b8588c2962f0bbdf238e0d3ced375a20804b4
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains an external URI pointing to 'ponafet.ru', which is likely part of a phishing or malware distribution chain. The PDF structure and embedded content suggest it's intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=d%2526d+beyond+review+2020
    • https://cdn-cms.f-static.net/uploads/4409623/normal_604a7425383ec.pdf
    • https://jujavaxoziwes.weebly.com/uploads/1/3/4/1/134108829/9594722.pdf
    • http://pobigajik.22web.org/romeo_and_juliet_story_in_malayalam_download.pdf
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/nuwolozuru.pdf
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/xepafidexegepe.pdf
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/7a5e8.pdf
    • http://fenofojerafama.22web.org/is_python_easier_than_javascript.pdf
    • https://static.s123-cdn-static.com/uploads/4366010/normal_600773c93648c.pdf
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/gelazupowuwesibij.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_603739fed8746.pdf
    • https://cdn.sqhk.co/fobonelaga/eid5jbQ/diy_ideas_to_sell.pdf
    • https://cdn.sqhk.co/lasijutag/kKhg9xM/buberuxezisidab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ab720cdc-0489-46b3-b87e-c1fcf6122b16/80909434045.pdf
    • http://lunagugodojeb.epizy.com/cladograma_de_animales.pdf
    • http://zekarevuwo.epizy.com/24927022797.pdf
    • https://uploads.strikinglycdn.com/files/3c9e25e3-46a8-4b0e-bff4-490ef2baaa90/ligidedivamagel.pdf
    • http://nukigisadowuwe.rf.gd/tuwaneporebemetufe.pdf
    • http://bolilolu.epizy.com/is_the_book_of_thoth_evil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e945.bin
9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 4156 bytes
font_01_sfnt_off0000f773.bin
85b5711f229f87e4ab92a0b1e39d753dcf9f32f2d5485b2749259b16f31a7572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10784 bytes

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