Malicious PDF — malware analysis report

Static analysis result for SHA-256 60e0c4000fe1d41b…

MALICIOUS

PDF

88.5 KB Created: 2021-05-27 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81014727798a419217809bbdca70aa1 SHA-1: 10d14b42f067a6037a95647a6b00e698e01c412b SHA-256: 60e0c4000fe1d41bdff2e517efce96e15f2614ded88fb8776de3332848f6a095
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by both ML classification and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. It contains a large number of external links, indicating it functions as a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=avengers+watch+thor+ragnarok+movie+fanfiction', suggests a lure related to popular media to entice users to click on malicious links. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=avengers+watch+thor+ragnarok+movie+fanfiction
    • https://badoguwogodunej.weebly.com/uploads/1/3/4/7/134713378/a541bfe73e78f.pdf
    • https://cdn-cms.f-static.net/uploads/4480891/normal_6039cd7d11ff0.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_60291c16dddca.pdf
    • https://devomideribura.weebly.com/uploads/1/3/4/4/134401990/6432408.pdf
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/xogibil-lejawogavurisa.pdf
    • https://jilazokezabise.weebly.com/uploads/1/3/5/2/135296918/1537136.pdf
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/4929468.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/daturopitito-vavakiwiler-toduduluzunexo-tefomijunepitem.pdf
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/zajafamofumumokas.pdf
    • https://maloxozalujov.weebly.com/uploads/1/3/4/6/134624338/74269e1bf17.pdf
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/7047411.pdf
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/9930269.pdf
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/kesola-vojesudowoti.pdf
    • https://cdn-cms.f-static.net/uploads/4402722/normal_60254ff9d432b.pdf
    • https://cdn-cms.f-static.net/uploads/4367004/normal_60413809276e1.pdf
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/8613497.pdf
    • https://lifigosup.weebly.com/uploads/1/3/4/8/134884960/8090566.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/795ff4b2d414.pdf
    • https://mawatewif.weebly.com/uploads/1/3/0/9/130969671/vafikisuti_kalukomipaxije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3aa79652-2ef8-442e-bd3f-0538fba906f0/82777866986.pdf
    • https://uploads.strikinglycdn.com/files/ef7c93ed-dc8e-4c5a-baa4-4d29eb2ae253/sijotomomeno.pdf
    • https://uploads.strikinglycdn.com/files/fc4b5ae9-c74a-4030-9ff0-ab74abfba0c2/unication_g5_pager_manual.pdf
    • https://uploads.strikinglycdn.com/files/2912234c-2b73-42e2-99c8-9892c19b4f23/347120435.pdf
    • https://uploads.strikinglycdn.com/files/6e9a9086-9ddc-4c53-8068-e9bfb04623ee/who_is_the_lady_in_the_new_doritos_commercial.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_off00011bb2.bin
b3bca83e54c0dfe72e95c9e8d41513bc7a939ea52a08b017dbe455b4221576e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 5468 bytes
font_01_sfnt_off00012e40.bin
ee34e4010572f5efa068aca9110d574e54b0c7db858c5813616b2ab2ceeb8b93
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 11216 bytes