Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ffd5f0ca7c33c9…

MALICIOUS

PDF

121.5 KB Created: 2021-03-21 23:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3e0c5feb629c646ff35ac8a3718c9a30 SHA-1: 26f02056f50ed0b261b8d5a405c314700952ac1f SHA-256: 37ffd5f0ca7c33c98b19c1f02502ce37697fd432229237931602091b08b0ce0f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=what+makes+the+australian+accent+unique PDF link annotation
    • http://thesimplycompleteseries.com/bonexuzugobomuveviwofu5buae.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/JXUrhif/porovapa.pdfIn PDF document text
    • http://nefritthebestthing.site/service_improvement_plan_sip_templates9dus6.pdfIn PDF document text
    • http://sdek-24.cc/kwikset_smartcode_909_resetzlttr.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/d8e62e1a13c.pdfIn PDF document text
    • http://znakomstva18x.site/introduction_to_information_systems_7th_edition_rainerp3puk.pdfIn PDF document text
    • http://copyrighthelpcentral.com/37135482981jw0ti.pdfIn PDF document text
    • http://komarovskii.xyz/quantitative_trading_systems_2nd_editionqj18q.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/dShjYih/setidegusevisoka.pdfIn PDF document text
    • http://garantiya62.ru/44031044183l6hcj.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/9309084.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/g5rGnsO/liverpool_fc_magazine_november_2020.pdfIn PDF document text
    • http://kubuvifabitowib.iblogger.org/maxezosejuwidaxeronukiw.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/purusafufax.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/pv6jfib/slice_of_life_romance_anime_crunchyroll.pdfIn PDF document text
    • http://strongcreditscore.info/1206913164196idt.pdfIn PDF document text
    • http://politach.com/suwugixuxofumanoemjh8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_7ce280637ead42e5b71ba14f3346d360.pdf?index=trueIn PDF document text
    • http://nufewaruxemo.epizy.com/mufaweteriwarafulanob.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_e8146c4be9374cfcb452082ca4d98a89.pdf?index=trueIn PDF document text
    • http://gikikojumikobep.epizy.com/easter_basket_paper_weaving_template.pdfIn PDF document text
    • http://xesijapapun.rf.gd/best_free_technical_drawing_software_for_mac.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_77632fde1ccf4b9f895341ecac3aff33.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_d14064acfd26437aa94970644ae5a5ae.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cb97784ac349489db2228e8444c6738e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA1 5240 bytes
SHA-256: e650a63fb07a8f400bc634a8ae345ff8abc0f5429615758f0b2246d1a75ea0ba
font_01_sfnt_off00019058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19058 15392 bytes
SHA-256: ae7187292a003863f53303960aff6c66150c78cafa6120fd25e679a78a02f706
font_02_sfnt_off0001c2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BC 16124 bytes
SHA-256: c4796d360747ae4fd9eeac79874e630371be8ecf18aa940379c07ae284daa94d