Malicious PDF — malware analysis report

Static analysis result for SHA-256 342791b15608559a…

MALICIOUS

PDF

82.0 KB Created: 2021-03-30 03:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 68253690babfbb0b012fdd73c06ad3a6 SHA-1: c338422338261583d00eda0de546d856c2f784d7 SHA-256: 342791b15608559a20743c7876c6a1af509153a82b25c3ba7f0e385bb27e1d96
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites like https://jumiwimov.ru/strik?utm_term=que+significa+definicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=que+significa+definicion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6052d8be54049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_601b6caa861d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5fd81eb533409.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/gdIjihe/42038477612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ffa20507c5af.pdfIn PDF document text
    • http://fesabip.iblogger.org/finding_sales_tax_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_604913d175386.pdfIn PDF document text
    • http://nititesosorejiw.iblogger.org/calendario_oficial_de_pagos_sep_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/jhdageD/88010841527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_6004b37260ee5.pdfIn PDF document text
    • http://zuzudijibogojag.22web.org/61900467122.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/vitamix_blender_juice_recipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_602210905db50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60223d0520c25.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://lanakupi.epizy.com/74506520209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af0cf73-fa94-4476-ba65-1d6e814e73f5/68861550814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a167d3e9-63fd-43c1-a361-d5be72642f00/dukowogofiwavorekoviso.pdfIn PDF document text
    • http://papewemejivore.rf.gd/react_js_tutorial_with_examples.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/40424800278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146eb158-675b-4e4e-858f-648687f990c3/does_light_therapy_work_for_acne_neutrogena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 4924 bytes
SHA-256: 7250eb0652150de386d4d5681fa40c1e57ac54d247ff89770cd893d73a970b47
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 12504 bytes
SHA-256: 6a518b173f4d76cc160782baa02109dbd96607adb2db2f100595c0f103bb157d
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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