Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2eac15bb5b72f8…

MALICIOUS

PDF

96.5 KB Created: 2021-04-01 21:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d7ccffa61219b10b341ebbe5408e7f SHA-1: ae2503a5842cc32e94044d3bb6eabf41211af8f2 SHA-256: cd2eac15bb5b72f8c486df93f7b50081077672f84c25927e322b9c692451c632
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme to distribute malicious content. The document body is heavily obfuscated and contains metadata related to PDF generation, but no clear textual lure is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=lego+power+miners+minifigures
    • http://wutugidejavazu.scienceontheweb.net/gizeb.pdf
    • http://gufurebu.medianewsonline.com/kenarudozu.pdf
    • https://static.s123-cdn-static.com/uploads/4444366/normal_6008bf449282d.pdf
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/fuwugosewepis.pdf
    • https://cdn.sqhk.co/tezizejaropu/iFSgid4/stickman_ghost_2_gun_sword.pdf
    • http://bilabeseximilew.22web.org/across_the_universe_chords.pdf
    • http://xutexukoxobofi.mywebcommunity.org/roraropebinomezizefijujaj.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_60490fd924a1b.pdf
    • https://cdn-cms.f-static.net/uploads/4385635/normal_603d70692f8b3.pdf
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/bab48.pdf
    • https://cdn.sqhk.co/vimewiki/hhaJgg9/soxilukodulobenugu.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601726500e1f8.pdf
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/6606228.pdf
    • http://xufunuduxatene.iblogger.org/53398896941.pdf
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fed2c0e9a006.pdf
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/b63c1.pdf
    • https://cdn-cms.f-static.net/uploads/4501810/normal_603a627dc4b3c.pdf
    • https://cdn.sqhk.co/dobopejig/bjjCjin/piraroluzanido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vifewupanog.epizy.com/vagomujonasafudoz.pdf
    • http://madukavinoxonal.epizy.com/ark_all_saints_academy_ofsted_report.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_off00013cce.bin
00b443c53a6ba623d19fc66daa82299ad1fac9aea8b81c727b878b57169a379c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 5012 bytes
font_01_sfnt_off00014de9.bin
a244c5592858f566efb3b44c5ebd1ac55e1fa58d6b4f5f5ee45687aa4e6b9d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE9 11396 bytes

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