Malicious PDF — malware analysis report

Static analysis result for SHA-256 89815bb643c46089…

MALICIOUS

PDF

155.9 KB Created: 2021-05-03 19:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1333a7f2a0341710c91ccaa23d20771f SHA-1: 4419f70fe0ef7d5c31facbb7815b022464c2a60c SHA-256: 89815bb643c46089f1eea5f747b3adce0e337d59269a8eef490f6146bb486dd9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to 'Agatha Christie novel after disappearance', suggesting a phishing attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates a strong intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=agatha+christie+novel+after+disappearance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6045e6f15e95a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_6059e7f1b42d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_601a2553191f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_605150263fdb3.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/azusa_street_miracles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_60053806a2434.pdfIn PDF document text
    • http://jumpfs.space/zapajomolebedebeminow8j8vv.pdfIn PDF document text
    • http://makamar.xyz/radufupepijuxokilq2j4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_6068a3b92ef8f.pdfIn PDF document text
    • http://pet-guru.shop/2133907041644a7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_605ad6e6e4192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_6029b54072210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_6062a6a2ceabf.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/dejelukuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60339264edb66.pdfIn PDF document text
    • http://teagreen.space/dragonvale_online_hack_tool_no_surveyjkxfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_603a47ff4ee28.pdfIn PDF document text
    • http://uber-global.com/what_does_the_woodcock_johnson_test_measureqdmzk.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
    • http://relivoziz.atwebpages.com/11680986489.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_44ab22ed8818451d920ebd52929f1a14.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/4638504860.pdfIn PDF document text
    • http://mojenuj.atwebpages.com/educational_research_quantitative_qualitative_and_mixed_approaches_4th_edition.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_cfb048db0cea4a96be6d698e3712adee.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_off00021a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A1D 5252 bytes
SHA-256: df0f9af770604e70377118a5edf8fbe729ef6890025de0fa67598a3aedda0faa
font_01_sfnt_off00022bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BFC 11904 bytes
SHA-256: 8273327e83546e94b47449013a986958120086d7f64767aba8d8c8ccd5157669
font_02_sfnt_off000253b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253B5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3