Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdca9e8b7eec95a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 00:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e684f50f8cb947c9136793330c45cdbc SHA-1: 7bc492ff81655aa29e6758b62436244636f1e673 SHA-256: 5bdca9e8b7eec95a16b98203f7b185f25d11c6bc2638a43b3b84e1402daf4f21
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains multiple embedded URLs, with one prominent URL pointing to 'jumiwimov.ru' which is associated with a lure about connecting a Canon camera. The document body, though heavily obfuscated, contains fragments that align with this lure. The presence of numerous external links, many on disposable hosting, further supports a malicious intent, likely to redirect users to phishing sites or download further payloads.

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=how+to+connect+canon+vixia+hf+r800+to+computer+for+live+streaming
    • http://wowogobofomufu.mygamesonline.org/taiwan_visa_application_form_2020.pdf
    • http://krokoboko3.xyz/sepatobiratidokerapsvu6v.pdf
    • http://tadidavazutopa.sportsontheweb.net/98801502335.pdf
    • http://zefujixa.mywebcommunity.org/marcus_aurelius_meditations_original_greek.pdf
    • http://kartaidatodemeleri.com/36858700645a1rm4.pdf
    • http://edevletorg.com/98717241238pl37s.pdf
    • http://newipufisatag.scienceontheweb.net/isometric_grid_paper_a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suxudogakol.myartsonline.com/pneumocystis_carinii_pneumonia_treatment_guidelines.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_746c0dcae2a2440eb8616affc86648ef.pdf?index=true
    • http://sogivuwe.onlinewebshop.net/xubabeb.pdf
    • https://uploads.strikinglycdn.com/files/6e323989-d13d-42db-8ace-dd46aff00f08/relationship_between_old_testament_and_new_testament_bible.pdf
    • https://uploads.strikinglycdn.com/files/0a32ba4f-3227-4bcb-8943-54b5b568a626/valojexiliwem.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_5248e06364bd4ba7a08e3a9b6836c7bb.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_c0e51f1de9bf415380c92efdc08c46f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5457b007-26ec-4ce6-b8ac-c30c9b63b60f/what_are_the_different_method_used_in_mining.pdf
    • http://tebuwawezizafes.onlinewebshop.net/sizesedawidixediwamu.pdf
    • 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_off0000ec34.bin
3be011d8642e1ad5eb16158be43740a7a83e1d77a85aa63624dec62f9bc200e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5944 bytes
font_01_sfnt_off00010061.bin
50c65f6adf6260ac17e131e9f0f6c2373146dc1743c17a44ecbaf920f9ac73f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 11280 bytes

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