Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd10e45136302e3e…

MALICIOUS

PDF

71.9 KB Created: 2021-02-14 03:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b1a8f11e0a951588651469fda53b2b3 SHA-1: b1b13e743254e0ea76c67870801d87e7834acf1c SHA-256: fd10e45136302e3e83d491b61808953f65100422281e38309f73ad88d8130f75
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

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=roblox+sex+scripts+2020 PDF link annotation
    • http://noxodexuvalolum.iblogger.org/kemei_trimmer_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/hcx2zcu/top_5_trending_hashtags_on_twitter_right_now.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/Iieiggi/beautyrest_drifton_mattress.pdfIn PDF document text
    • http://ziminedefus.iblogger.org/xutozegeli.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/287661e113f7.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/7427241.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/JjbBzif/jeman.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/fafarimasezumokokabo.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/761b585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/66475263969.pdfIn PDF document text
    • http://zusirana.rf.gd/wabatezed.pdfIn PDF document text
    • http://juvikavirilija.rf.gd/fapife.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/344241075.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/animist_religion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 4888 bytes
SHA-256: 3fba79bfbf535883a7aaca98c76806c05ef8cb135abc5d7742217ea67ed68b18
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 10448 bytes
SHA-256: cce6d674957c0c62b19e472d3419215744b78560279433b72598ed11662dfeae
font_02_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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