Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bc1ddc058e8665…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 06:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8103a89151470a85d2bf995d55c6609 SHA-1: c3838306d95f4d1e4219686e925355f25a5b988d SHA-256: 98bc1ddc058e86653bc5de3aae80236199978b146093f91344fe065fccbfad26
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 0.9991

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://jacksth.ru/wix?keyword=national+senior+games+2020+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd96d4a0f2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_60468723acd20.pdfIn PDF document text
    • http://sepibuzare.22web.org/12239542976.pdfIn PDF document text
    • https://wazidufadik.weebly.com/uploads/1/3/0/7/130740116/renudafo-liruwir-gijaf-pizadimi.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/wuzesapu.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/pezibutu.pdfIn PDF document text
    • http://sodofuwaxidida.22web.org/52673880232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5fffe0f932edd.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/roxivinubiderij-piseda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_60088d37d504c.pdfIn PDF document text
    • http://julovafen.22web.org/what_zodiac_sign_does_the_death_card_represent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6044fea21d067.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/fekawemelolejizem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewozemiludex.rf.gd/gawavakarijajuzekal.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_10571395ac1f4d0185e5d1386fad52f8.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_82a6d4fad13d4656812e5d8f34a89dd0.pdf?index=trueIn PDF document text
    • http://buwomir.epizy.com/english_listening_activities_free.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_16f292801cca4da3b5fa139c5abe634a.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_7f9a0f34c1704394877752f8c305bd77.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_e67cc11cdd7b4b108d3dbf574de59954.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_245a0d9fa5b343df866957c6dbde8181.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_4e6815f31c39411c91279e5f876efb22.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_affe26a9c5f84810b821e5522f945c0f.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_0b3fdedf516e4b829dcdafe96ff129b9.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5360 bytes
SHA-256: e3ccb3107ad39a117ca549deac9204a713c46918665320cd77f6ca80f8e26711
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10808 bytes
SHA-256: 0949d4709009ed50a44cdea6600247da454d2c2bd9cd86c89768e59db2eff58f