Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e99b78f4955dd…

MALICIOUS

PDF

81.3 KB Created: 2021-04-04 15:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 456fcca41cd8c5904ad04f4d846f0038 SHA-1: 53893119d073b8f2af65b46ca9cb110f61f0852c SHA-256: fd0e99b78f4955dddbbfd822e1c6e27cfdd3218be5b7965941ea984e908d9377
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/strik?utm_term=christian+daily+prayer+book+pdf PDF link annotation
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/c090055.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/47dd4c32cbb196.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/norcold_refrigerator_not_working_on_electric.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/duloxofavuramex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fda27f64df24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff25e613b1a5.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/rulitupeg_vevutinuvomu_gizedepidelebi_legidixurulo.pdfIn PDF document text
    • http://zelopaqq.xyz/defining_relative_clauses_exercises_pre-intermediatekj0vp.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/xawixajiwunazev_muzonodamaz_bisikefafawew_nikomawexo.pdfIn PDF document text
    • http://maddot.space/99707084327kgp1b.pdfIn PDF document text
    • http://hotita.space/wajeges4jhh7.pdfIn PDF document text
    • http://o-karte-kopilka.com/zokamuwobagixe7871i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600c70e537d9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_52a864ac95134d6a9f29af29f312a322.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_772534596ecc4ccca65b72b6d7316eb1.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_8d1e23c7367c4374b20f22e97c03a252.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_d1b432d0a5fa476bb57e3a0dbc952ca6.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_a2b8492f907543349980430a215c7166.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_31e7c9698a8246cabdfa25f0bc1b3a37.pdf?index=trueIn PDF document text
    • http://sefokirof.onlinewebshop.net/2206988323.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_d0ae89fa5cd44cf68e397a1a29ca4250.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 5340 bytes
SHA-256: 63c5f0e7952dc77dd6e090c67ed2c7cb9f028d337d021b65a89b1e8f65f36d8e
font_01_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 10784 bytes
SHA-256: 1138320bcbd0fb7f3d459821d1fb4a1f471c29a5e1b58c97fde5b28911830817