Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1c35a6df9746dd…

MALICIOUS

PDF

81.6 KB Created: 2021-03-10 09:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 466d6484a0bee901d1b4cd7114230790 SHA-1: 604e622c986c0ecbd1564f98e44b8348b5cdf88a SHA-256: 1d1c35a6df9746dd7185a88fad9334283d692cd80888d67f240a51ded345f0d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://maypoin.ru/award?keyword=il+bovarismo+jules+de+gaultier+pdf, which is likely used to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=il+bovarismo+jules+de+gaultier+pdf
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/sukigujo_kitakarupunuled_kelupugul_pokudipubi.pdf
    • http://liberum.sportsontheweb.net/nagadoro.pdf
    • http://nikecortez.net/lukifivezugirenudevadu82w5s.pdf
    • http://fanutoragozogow.sportsontheweb.net/how_to_use_onxmaps_on_garmin_64st.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/gojokunekazibe.pdf
    • http://xumupizaxuto.scienceontheweb.net/pretty_little_liars_cast_season_1_episode_21.pdf
    • http://jidogirikar.mygamesonline.org/mathematical_model_of_control_system.pdf
    • http://sunazeremitiwu.mypressonline.com/texas_instruments_ti_30x_iis_scientific_calculator.pdf
    • http://rolopigabetitu.scienceontheweb.net/15681896148.pdf
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/2636255.pdf
    • http://help-ruleviolation.com/49728508894j1cqe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb22633f-30bc-4772-86f3-c4f317b2fff1/mebijilaraxaras.pdf
    • https://uploads.strikinglycdn.com/files/3ab7cc72-becb-47db-a746-b8bf67d4d5cb/supodevupopexape.pdf
    • https://uploads.strikinglycdn.com/files/6bc32fb9-a819-4586-bc8d-b876a40b5f4b/75707929688.pdf
    • https://uploads.strikinglycdn.com/files/02ddc2b5-7104-4383-818a-5b48d7563a15/gudixojuletam.pdf
    • https://uploads.strikinglycdn.com/files/dca9a26c-5d46-498b-946c-ee169ef6c573/how_to_write_a_business_case_study_template.pdf
    • https://uploads.strikinglycdn.com/files/21899841-7be0-4ea0-8477-ae9f61b688c7/how_to_configure_motorola_sbg6580.pdf
    • https://uploads.strikinglycdn.com/files/aa7b5473-c789-493f-804f-685815ed15a9/54514501452.pdf
    • http://murapimopavopa.myartsonline.com/lecturas_espaolas_azorin.pdf
    • http://nufiwimuzobo.onlinewebshop.net/35477325640.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_off0000fd0e.bin
7f6b9607560c9aab29c0cc7ffdfcfdd4f766e5fb5b0ae20f41519298d6388a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 5576 bytes
font_01_sfnt_off00010ff9.bin
c31a20a88839611205a29199e8b48b9649237084a9d3d8ac52288cf36e261b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 12556 bytes

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