Malicious PDF — malware analysis report

Static analysis result for SHA-256 91890fc18d47bf2d…

MALICIOUS

PDF

75.5 KB Created: 2021-02-19 16:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16a8b142f879a2f7cd83786a534be07b SHA-1: abb564df05a908a0dfd0ae973bf78137ac518390 SHA-256: 91890fc18d47bf2d5e11afe212e1c5ec44ad921348c0d747ec001b93c9d578a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'jottigo.ru', suggesting a lure to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, reinforcing the phishing or malware distribution intent.

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://jottigo.ru/wb?keyword=blender%20animation%20tutorial%20beginner%20pdf PDF link annotation
    • https://cdn.sqhk.co/nixenexax/zpibihZ/zevodalur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601a875e117ed.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/7b74d41.pdfIn PDF document text
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/nuverumokezuzojute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fc85271ef4bc.pdfIn PDF document text
    • http://uablog.website/hdx_wire_shelf_parts85tku.pdfIn PDF document text
    • http://nutristrike-shop.ru/zombie_killer_squad_mod_apk1ompx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcb02d18e053.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/ff41a02c6871.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/1354978cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5ffc495d03777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/mikaxawefi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/89821633776.pdfIn PDF document text
    • http://xesugowoxufe.epizy.com/gizuxudolelarebem.pdfIn PDF document text
    • http://notalopelovawu.epizy.com/abzu_steam_achievement_guide.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_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 5372 bytes
SHA-256: d85c30859520662da92dfb26cc7356f584dec160733a7e23205f604bb9da6293
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10660 bytes
SHA-256: 96b56dd67974924af274c4232005a81a5903cc984aef717b7a86b4bd20043c11

Open this report in the interactive analyzer, or submit your own file for analysis.