Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fc8604bab85b26…

MALICIOUS

PDF

85.3 KB Created: 2021-06-12 16:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4ad89708aef2432ed447bc3fb25e92ed SHA-1: 1fb2fa1d0b0e5598e497002d018859cda08a2a8f SHA-256: 09fc8604bab85b262532c86ba2b53a7ba45ef14c5fb97caa2335a276fb8ffa5a
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=psp+3+emulator+apk PDF link annotation
    • https://joxezikawatunex.weebly.com/uploads/1/3/4/6/134699300/vodotanuwu.pdfIn PDF document text
    • https://duwodalufe.weebly.com/uploads/1/3/3/9/133997525/5262287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5fe1b0ff831c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60c474ad28237.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369304/normal_60b5a8a1ca7e0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494440/normal_60afe63280e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_60bd36e9a175b.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/birelejosalex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_60567b69d1f6b.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/d89fc94d0e2.pdfIn PDF document text
    • https://kenopawubiwo.weebly.com/uploads/1/3/4/4/134459696/kovuf_juvib.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/5587714.pdfIn PDF document text
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/moluz-zufefovij-puremetekogek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5ffc7fbbc3179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_604e3956cc15f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383300/normal_600847826359c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_60bea7d458ce3.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/muvofasupujixudewut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_603e2596aa575.pdfIn PDF document text
    • https://jasiximipiz.weebly.com/uploads/1/3/1/4/131453573/d0a51caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_60479589b93bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesababa.pbworks.com/f/how_many_combinations_with_5_numbers_1-45.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144514317/rcc_column_design_excel_sheets_as_per_is_456.pdfIn PDF document text
    • http://vobaranizume.pbworks.com/w/file/fetch/145070112/fopobuji.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_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 5196 bytes
SHA-256: 2e8b99e3d1ae53f8d265c057412bb6180609c93cb21d109a2979c1daa2421615
font_01_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 15952 bytes
SHA-256: 41d7def5ac9f9796d087b28d7e5b2ffb151a647bdb4496c79a1320304cda7b5a