Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b4d286a886abe4…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 05:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8bffdb611fb88d84d954cdd62827b7e SHA-1: 980f2d032953f354dc1e4a0b7ddd40bf091d1e89 SHA-256: 11b4d286a886abe44ad44bc42b0ded66647218f51b20c77bbf8547b5bc9b362b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jottigo.ru' and disguised as a 'drug information handbook', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the use of disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=drug+information+handbook+2019+pdf
    • http://fullstacket.online/flir_one_pro_gen_iii_for_androidj24sr.pdf
    • http://pycnidwzxc.info/antutu_benchmark_apk_uptodownoup45.pdf
    • http://cosmeteca.com/how_to_sync_victsing_speakerqs8jh.pdf
    • http://vowuzemiru.medianewsonline.com/80000323573.pdf
    • http://koolmaxt.online/vadoxibirirepab1105.pdf
    • http://axecheat9.xyz/tazepuxigulurokiwukovisxpswa.pdf
    • http://3203epworthcres.com/69738702058opqxu.pdf
    • http://dududuw.mypressonline.com/lepitoporugon.pdf
    • http://intereriia.com/soxamemamivubin8tcn6.pdf
    • http://snegny.com/tenezejce0af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/196ed249-1c31-404a-959f-d76bea74e04a/17981942995.pdf
    • http://koriwironawuva.myartsonline.com/bayesian_data_analysis_third_edition.pdf
    • https://s3.amazonaws.com/mexesazaxasa/federal_government_minister_for_human_services.pdf
    • https://s3.amazonaws.com/rakabexozu/59109884641.pdf
    • https://uploads.strikinglycdn.com/files/267fb15c-01e9-4441-b8ea-07e4f9e3599c/yoga_mudra_images.pdf
    • https://uploads.strikinglycdn.com/files/2d4a8339-bbd5-4f7d-8497-91993ce0e4a0/mofov.pdf
    • https://s3.amazonaws.com/lixuduwonifa/64174297936.pdf
    • https://uploads.strikinglycdn.com/files/36dfc74a-d537-484a-b8f1-1c6067c5a954/samsung_wa400pjhdwr_aa_service_manual.pdf
    • http://pekamidakoj.atwebpages.com/what_is_the_best_shark_upright_vacuum_cleaner.pdf
    • https://s3.amazonaws.com/debiwelof/xigomubasinexatifovodaxa.pdf
    • https://uploads.strikinglycdn.com/files/54c21fb9-cd6e-4244-8e95-871661f21a70/asus_rt-n12_router_password_reset.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/82066821920.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin
7c54c13321a22b13e8c8cf75e560e9151677e82cfd7fb4553fa360d909f90a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 3304 bytes
font_01_sfnt_off0000e36b.bin
ecf69107f8c6c0c263e85d9535006d75394c977174fa630809ed74ba5dddc3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 5696 bytes
font_02_sfnt_off0000f691.bin
dfbbe3e1acab88fab3b6ae767214824057fc3a7e422d09dbe35ddbc84562be28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10756 bytes
font_03_sfnt_off00011ac9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 4324 bytes

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