Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed328d53e38f62aa…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 11:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b49d5ba14cd954eedd6c34a567ae46b1 SHA-1: 96639cbc2dff542cccd876af0c91dc997df59e2d SHA-256: ed328d53e38f62aafdccc982e5fb674b59d3bf82fec5ef94cd58cfac14c30e03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs suggests the document is designed to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=free+unblocked+music+rap+music+at+school PDF link annotation
    • http://axacheat4.xyz/9001_iso_2015_quality_manualx5z4b.pdfIn PDF document text
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/5393583.pdfIn PDF document text
    • http://marojuburegorad.22web.org/a_dolls_house_social_setting.pdfIn PDF document text
    • http://50off.pro/biological_wastewater_treatment_series_volume_4ounuz.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/reicast_dreamcast_emulator_apkqlfla.pdfIn PDF document text
    • https://kumisorulilinim.weebly.com/uploads/1/3/4/7/134750082/zorufis-lipusepefefoda-rijem.pdfIn PDF document text
    • http://foyou.store/bissell_proheat_spare_partsm0fi6.pdfIn PDF document text
    • http://all-host.site/tabewojujofuvileoo1h3.pdfIn PDF document text
    • http://fit-italy.space/bobol_wifi_zte_via_androidlh7dq.pdfIn PDF document text
    • http://profer-opt.ru/80628424217926od.pdfIn PDF document text
    • http://respect-ltd.su/82785579336h65df.pdfIn PDF document text
    • http://womans30planet.com/subaru_marketing_strategyybtju.pdfIn PDF document text
    • http://bostpolamos.site/ar_15_lower_receiver_takedown_pins2lup8.pdfIn PDF document text
    • http://izzzaaa.space/exsultate_justi_john_williams_sheet_musicrp49q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/tabla_de_medidas_milimetros_y_pulgadas.pdfIn PDF document text
    • http://nitumajalu.epizy.com/muxovomo.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/consumer_buying_behavior.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/graphic_design_software_free.pdfIn PDF document text
    • http://nudegew.rf.gd/lesepij.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/nodoxa.pdfIn PDF document text
    • http://jokosen.atwebpages.com/mi_gente_translation_english_spanish_dictionary_reverso.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_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 5472 bytes
SHA-256: e7546e3579a787beb5b49bb6cd59855cc5c8a3ec971a39051059a63fc8a1aa36
font_01_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 11184 bytes
SHA-256: 357c17741eac374f29ded96c3f0080390d29d0a271b03d9aa549d1587abbf54a

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