Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffd71dffe06ae9d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-23 09:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c735a537920492f7e47cbc77f683c74 SHA-1: dd3318510d8561b51dd151c4b7e4dde578cf0edf SHA-256: 0ffd71dffe06ae9dc896269d7eefd2ec1e5ab865216a96dbc9e35f4e7bb8127e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to external sites such as 'lozipotod.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely involving the download of further malicious content.

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://lozipotod.ru/wix?keyword=solving+linear+systems+by+substitution+worksheet PDF link annotation
    • http://devigebogubiret.getenjoyment.net/online_editor_free_download_full_version.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/43266846297.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/18e8a656c.pdfIn PDF document text
    • http://xiletunekukine.iblogger.org/59945244887.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/wikojaki_gikevu_newififiwibu.pdfIn PDF document text
    • http://kulovemalam.22web.org/catia_v6_tutorial_beginner.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/27907867773.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/cultural_theory_and_popular_culture_a_reader.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/how_to_use_krups_espresso_machine_xp3208.pdfIn PDF document text
    • http://tafedudim.22web.org/old_newspaper_template_psd_free.pdfIn PDF document text
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/vitad-zuzivazobax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojovosis.rf.gd/sakiloziwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f4f032-a308-4229-8247-4ab53c747987/pudeta.pdfIn PDF document text
    • http://zerozuru.epizy.com/vulotilesi.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/castrol_gtx_diesel_15w40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4b6b48-8c6b-4f76-a400-806a5884e383/gilexol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788e101-8d07-4443-a1b4-bd20a0d083a7/91671970688.pdfIn PDF document text
    • http://kigetivizaru.epizy.com/apple_airpods_android_control.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/18104545786.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5660 bytes
SHA-256: 1a2f3c6d3fcbd5b33b2f73f1190c82b1bdfc4c28488f957fa63b4992ce3cf789
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10584 bytes
SHA-256: 321618569344d91cd7bf5a8e08eb2f3f44c2612f18f96a22b2f34a42befa9a26

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