Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f0ce72fea98dc4…

MALICIOUS

PDF

85.1 KB Created: 2021-03-18 14:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 527bc6dd41bb3c0e60a3147da34e240a SHA-1: dedfce5eb8d9201a0fa1e9504cde1a9e4b9a7c46 SHA-256: f2f0ce72fea98dc45ec7ef1869d044b08074f8ce8e4d4bffe053634985af27ad
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jottigo.ru') that is likely part of a link farm designed to redirect users. The presence of a 'download button' lure further supports the idea that the document is intended to trick the user into initiating a download or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=mathematical+reasoning+pdf+ncert PDF link annotation
    • http://shortsomfj.space/2044156866jnqhx.pdfIn PDF document text
    • https://cdn.sqhk.co/moranunemuk/ghjcbgg/short_guided_progressive_muscle_relaxation.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/ghkVhjV/car_racing_game_apk_download_for_pc.pdfIn PDF document text
    • http://gawuguvososu.iblogger.org/lurumulowukukovipetit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_5fd1ff20ab226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_604eb280e264c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fdc2ed278218.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/jifjgie/vatabavididirepemufusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_43da5a0bc0af4199a60948d3609d6204.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_82313cda3f554ac1a075469c6653968f.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_9073308df98744079b2bb3ab6c39a88f.pdf?index=trueIn PDF document text
    • http://robexede.rf.gd/2019_accord_manual_review.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_6a0a94b8e0984c52911cae672e49cfdb.pdf?index=trueIn 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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 5572 bytes
SHA-256: 63d4e06b6f511f7f57add29099421c33e924217164a9f6dc165394a947c8a363
font_01_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 11336 bytes
SHA-256: 00dc4b646402798626d9ae59fcb64f5e84d76afed22496f6338614f00698866b
font_02_sfnt_off00013a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A97 3368 bytes
SHA-256: 20d26bd95dee08181b4730b4c7a37f6521d29b821c560425a75d13ff91a7423f

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