Malicious PDF — malware analysis report

Static analysis result for SHA-256 676ccecf604f21bb…

MALICIOUS

PDF

82.6 KB Created: 2021-02-02 02:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fff56ebe424fa713394ac1aa23bff7b0 SHA-1: c84e20d5a8cd91573267d5bebafaa4dc97a486ad SHA-256: 676ccecf604f21bbc7bf48af4819647ab69c4cb9b24ee5cf4e06b2fdd627c57b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified it as malicious, specifically a phishing trojan. The presence of external URIs and a link farm suggests an attempt to lure users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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/aws?utm_term=assemblies+of+god+ghana+logo PDF link annotation
    • http://macsk.space/zagexodusutamabajasiwuvqtrz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ffe83999c1a1.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/EzjjShc/siloxenunoworavoretilof.pdfIn PDF document text
    • http://kukushka.space/neon_road_bikehfed2.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/N8hdjhG/vudixufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_5fd17a3ee97c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fdc176120442.pdfIn PDF document text
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/kebavagobisakazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fd26fef55484.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/h6iikhf/pobevuramolewikigap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fe5d162507ec.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/d58957.pdfIn PDF document text
    • http://pefujogori.iblogger.org/axis_allies_europe_1940_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/jehaPjc/laganakenivi.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/v7WWhgi/subipozigukalisis.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/Bhjgehc/fakeruz.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/vozebisemejeloluro.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/rozewisasopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepamiruketujuf.epizy.com/bavesotuveduranim.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/gonasavoxir.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/sevimuduvumubiwukimebo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 5352 bytes
SHA-256: 5e51b903af11afaa88625974f08e6942834df1a8b9abf6ae2400a36bd9fb6792
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 11732 bytes
SHA-256: 079775148be096c1e3377707313dc6543c2b2855bb84a42a7d429aff78c0d72a

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