Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d61b85ceafb57f8…

MALICIOUS

PDF

72.0 KB Created: 2021-06-04 09:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fefb57f55a4f562dcc55256d52f5f56c SHA-1: dc102058a5173970c1605b3efa192dbf0d032546 SHA-256: 8d61b85ceafb57f8272e0b765463f5d964aba6a945eaaa6c96deef3a454e427a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains an embedded URI pointing to 'crysiq.ru', which is likely part of a phishing or malware distribution scheme. The PDF's structure and content suggest it's designed to trick users into visiting this external link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=texas+jurisprudence+exam+study+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473637/normal_606a2c3d2e1cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_60368333da29c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5fe3e43d10921.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/fupikejazozonisok.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/2071c5f1e747c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_603138551a1f0.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/2177478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fc9b7d3d3606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fd81794bb04d.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/zejak-vekoli-lotinukipi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480598/normal_60b47a57732b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_6039af299d15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fd0a4e64ab32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6044781febe1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84c2bd6-e009-4b6e-9cb7-e30710b12704/35706795927.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/17871825229.pdfIn PDF document text
    • http://lokiboz.pbworks.com/w/file/fetch/144442743/hollywood_movies_in_hindi_dubbed_free_download_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba64bbd-c11f-4c4a-9b56-7b07095c3e82/how_to_get_free_rp_in_pubg.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144465120/22089572662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b9c16c-02ea-4a0a-a946-ba0eec9b4db0/raymond_pallet_jack_model_8210_manual.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144597411/periodic_table_of_elements_with_names.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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 5640 bytes
SHA-256: ed70a76962f9ada57d6de3c48c13b8937e433f9ba42059dddbcc62cecabe190c
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 9860 bytes
SHA-256: 1bad4c8a2f1aaeb1274db784b635d99c9f89901a3dee7b9d1d9ebfc8f5ea4bf0

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