Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b389c26e179ca…

MALICIOUS

PDF

78.2 KB Created: 2021-04-07 00:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6bb269e8358604f6d0e9d80a05973ac0 SHA-1: b4a836ccfc8ab0ecb2b92c423388dfa518eb285b SHA-256: b05b389c26e179ca25bcbfa6e938ab6e8eef2a5d09cb1504651f800720fa2431
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains embedded URLs, one of which, https://kuzutuzo.ru/strik, is likely malicious and used as part of a phishing lure. The PDF's structure and embedded links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=the+wind+in+the+willows+tv+series+watch+online PDF link annotation
    • http://noxogejukebe.mypressonline.com/xeroxexad.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/el_budismo_historia.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/aadhar_card_date_of_birth_update_form.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/senabinapilekifudebexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_335d1170ba4b47e18b72c76abf6b4160.pdf?index=trueIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/pokadogifes.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_f6084ae381bf482a839a392c57ad402f.pdf?index=trueIn PDF document text
    • http://sevawudefogu.rf.gd/powerpoint_templates_free_2018_minimalist.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/68985659333.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_f39a4d23d3cb4d449b565da4f0dee1dc.pdf?index=trueIn PDF document text
    • http://rojepubaxogo.epizy.com/57703654152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b67b1f4-c04f-49d3-a61f-9cdf1d58c662/how_to_rig_mud_minnows_for_flounder.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/outlander_voyager_timeline.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_4b012c83896d4bfca23687f50759f658.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_274451d278624d3bbe11ba6da5832ecc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e9ac23-3ff3-4cf6-8471-f947f61f6b65/33630168952.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_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 5128 bytes
SHA-256: 53f31e84c6dec67c34d3ee39eff000450546e30a271fcff4ca3d8b7fc7c96fe6
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11004 bytes
SHA-256: 8021a7bd4e117048255a88b20c712b30895139ee8c0ec7783b33fe512c3f2b87

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