Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d866ce96e296da…

MALICIOUS

PDF

76.8 KB Created: 2021-05-27 08:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aceda37bf907583b1bcf07d9b3fcbcef SHA-1: ec3aa70a0da8e5d9a71f64b9d5b1d48d74171ea0 SHA-256: c0d866ce96e296dac6e3dfa73542366b284f02b032317d53eaebb5cbac15c078
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://xajibur.ru/strik?utm_term=is+cooked+broccoli+still+healthy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366316/normal_60667fc4cf098.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/486595.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/xidijuxewawilaxiw.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/wowixikerifivos.pdfIn PDF document text
    • https://tixiteto.weebly.com/uploads/1/3/5/2/135295688/5456680.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/2299473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_605aca50299ae.pdfIn PDF document text
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/0ff1f.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/e5519f.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/delun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_606ce0494927d.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/21fdda8a1ab.pdfIn PDF document text
    • https://ponasamexow.weebly.com/uploads/1/3/1/3/131398296/7514551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486981/normal_5fd7864a714dd.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/985da2.pdfIn PDF document text
    • https://ferodamogeko.weebly.com/uploads/1/3/5/3/135330017/gagakig.pdfIn PDF document text
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/foruten.pdfIn PDF document text
    • https://jimakujomeda.weebly.com/uploads/1/3/4/4/134438408/taluja_pofupul_fiwuxewajalo.pdfIn PDF document text
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/4092228.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/majunoji-soval-nukad-ruzerobodifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383791/normal_5ffb4b1dbba6f.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/piger-kikam-nanafigev-vawikokud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68b23d8-d570-4061-8282-e508c0e12468/car_ecu_repair_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bddc020-045f-4dea-9801-f50fa03541a9/sigma_400_bike_computer_owners_manual.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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5272 bytes
SHA-256: b22276d3e16d473693243a17104d2dac23b021ce42b96eee56c0d1c9f46d23c6
font_01_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10840 bytes
SHA-256: d9522a525350e56d414a3812e4fcbdfc0e2e810bc2e9b165bbd3e4b67e84e178