Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7504f9017bcf7f7…

MALICIOUS

PDF

78.5 KB Created: 2021-04-05 18:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e03c5a60aafbb601930953bf485b011f SHA-1: 6b05b8a7c796b3aa331b7b6375da05a84a83bb4c SHA-256: a7504f9017bcf7f7105b4d79fc97ac8a5ae82db7da3baef6068d69d75643eff3
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one pointing to 'jumiwimov.ru' which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=cuisinart+supreme+grind+automatic+burr+mill+review
    • http://suraneb.scienceontheweb.net/beats_studio_3_wireless_prices.pdf
    • https://cdn.sqhk.co/xopuxuvop/ghcijgf/theme_park_simulator_ps4_test.pdf
    • http://parhelifrl.space/husqvarna_model_yth20k46_drive_belt3tivx.pdf
    • https://cdn.sqhk.co/dozirolizilu/hicmMhc/feudalism_pyramid_hierarchy.pdf
    • http://italiahot.fun/jijarijomerokuzonotosodobwmfl.pdf
    • http://zisudupasukivop.iblogger.org/pathfinder_character_sheet_builder.pdf
    • https://cdn.sqhk.co/riroxale/gjfLY0B/javelin_master_3_mod_apk.pdf
    • https://cdn.sqhk.co/xupodafib/gigifhc/pocket_stables_apkhere.pdf
    • http://bavimobuxadu.medianewsonline.com/what_is_the_purpose_of_pandoras_box.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://voderekop.rf.gd/79652882829.pdf
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_ccbeded32e6c45d787a1248fc6ebcccd.pdf?index=true
    • http://pijularof.epizy.com/jinifovijozov.pdf
    • http://nederanunotaz.rf.gd/21646205472.pdf
    • http://wenares.myartsonline.com/ethiopian_grade_11_biology_student_textbook.pdf
    • http://zozoresupiz.epizy.com/35842493157.pdf
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_2890c61bf390457aa105e68f5d427b5c.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_48697d7a39354a6cabfc8bfb58b7c6f9.pdf?index=true
    • http://bawesokiri.epizy.com/18087938159.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_f242b27c725c408d9602b39feb86e9c3.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_329d62c5953643de9eb34702bf954c79.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b8.bin
0178ee09d01d6dd78b39961e0b10075c3f101c8d74e73f7e36200363fb0667ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 5588 bytes
font_01_sfnt_off000105ae.bin
4b2fe59a828f603fc16a202296fc7e6370d7650a22f2507b89c6fa811db45b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10848 bytes

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