Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51ab780b55bccbc…

MALICIOUS

PDF

81.5 KB Created: 2021-04-07 03:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 47665597ee2eedb680f5253e88e9fd77 SHA-1: 5acff62aa77c603423363f8d1a6ae714ea8fe946 SHA-256: b51ab780b55bccbc827b36b9ae2afe6669a69506f00727d02c4d90a703fd3f3b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

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://pelibifir.ru/award?keyword=generic+credit+card+authorization+form+pdf PDF link annotation
    • http://questotzvezd.space/battle_realms_free_for_pc4x71h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_60032a6783ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_60393ce1d4045.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/nidini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_5fe64fbfdefd6.pdfIn PDF document text
    • http://telgrm.site/how_to_ask_for_a_reference_letter_exampletj7ua.pdfIn PDF document text
    • http://xrootunited.com/35412166190gi4ao.pdfIn PDF document text
    • http://motivawka.online/remufudojukewuzb7k3.pdfIn PDF document text
    • http://forexgeeks.net/hebrew_word_pictures_frank_seekinsxxfvb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_605f73231973a.pdfIn PDF document text
    • http://sebamusimuduj.iblogger.org/63151998431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fed6e7ce6e2e.pdfIn PDF document text
    • http://tryadasert.online/667926542766lwld.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://notufexunu.rf.gd/la_ciudad_de_las_bestias_isabel_allende_descargar.pdfIn PDF document text
    • http://guvubaxi.epizy.com/806384696.pdfIn PDF document text
    • http://vafipisepofowo.epizy.com/sony_headphones_1000xm3_manual.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_53a193e1f1de4b8a96b610b837f9d573.pdf?index=trueIn PDF document text
    • http://tesepesizaz.rf.gd/uranium_decay_chain.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_433bb55922f9433db28c7cd326c12731.pdf?index=trueIn PDF document text
    • http://perotufusutukes.epizy.com/divulifipuwi.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_9fd181ec8a07408498b26b455189d354.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5148 bytes
SHA-256: d912a0d5f4b55879ef980699d6307fd4bf1cf3e05b662201011d331cc000c30f
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10384 bytes
SHA-256: f08e79b048a767357bf70f14ec3c84559c2f0df516a9441400cf350235d111e1
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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