Malicious PDF — malware analysis report

Static analysis result for SHA-256 961444ffdea999b7…

MALICIOUS

PDF

70.0 KB Created: 2021-02-12 18:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5da12d12ab6ab90d7c49678081739e13 SHA-1: a5db733f781dec420302f4d3f75a7db9c3df471d SHA-256: 961444ffdea999b7d8fa0f7c42c6e35619193b1f405ffce183fc6a2c7415d891
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body contains a lure related to downloading 'steam achievement manager', and it embeds numerous external URLs, one of which is a link farm designed to redirect users. The presence of external URIs and the overall structure suggest this PDF is part of a phishing or malware distribution scheme.

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://jacksth.ru/wix?keyword=steam+achievement+manager+download PDF link annotation
    • https://cdn.sqhk.co/sidogorego/YjgicTd/broken_dawn_2_mod_apk.pdfIn PDF document text
    • http://securityverifiedservices.com/katominadaniziru4iua2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fd2411caf1b7.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/b708c0f.pdfIn PDF document text
    • http://bepegut.iblogger.org/96684493388.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/Rdjgfyn/29er_wheelie_bike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6010e2bc18263.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/mobowi-basuwilav-tiwexozarumu-naloluwix.pdfIn PDF document text
    • http://my-favshop.online/60869381349jg8mp.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/webawoza.pdfIn PDF document text
    • https://gonagulinifuf.weebly.com/uploads/1/3/1/8/131856247/vomopofinutixunonuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff04bf07bdcf.pdfIn PDF document text
    • http://mmmuuuue.space/17462246222uee7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegidil.rf.gd/mugovolamunepuzuvumuku.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/aula_de_espanhol_iniciante.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5432 bytes
SHA-256: 0c3f078cce9246596c1c6313686950ec56bfa0337f004dbbd054467cf566d783
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 10428 bytes
SHA-256: 7ea4e60cdf0db3cb6ceba962e9a8ba71b34be10c5529c89c93c182773f74ceee

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