Malicious PDF — malware analysis report

Static analysis result for SHA-256 20829039c6f137f0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 09:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ff379529c7d14ef730b00a976cf17a18 SHA-1: ddc87b5e304199669c1004deed9e24b572751dad SHA-256: 20829039c6f137f03a8ecd69403dcd54ed6b85b66cc87a956a38195e6050002f
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 0.9993

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://xezojetit.ru/strik?utm_term=how+to+install+a+honeywell+filter PDF link annotation
    • https://ludojuvixodezo.weebly.com/uploads/1/3/1/8/131856813/7312180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_6010cb23a0709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fdd8336dddd0.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/sovigopixojadudazebidax.pdfIn PDF document text
    • http://gonimuliveza.22web.org/curriculum_vitae_format_in_french.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_604d7c89d1a32.pdfIn PDF document text
    • https://bejutenexej.weebly.com/uploads/1/3/3/9/133997629/dofito-vuvusejugavup.pdfIn PDF document text
    • http://fiselijuduguge.iblogger.org/4935454947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_6037172cd7206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_60435e49f278d.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/financial_auditing_process.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/bible_atlas_free_download.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/lumajelaban.pdfIn PDF document text
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/zenajof-foxikizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ef5004bd70434a23b9f95c2a78526753.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_2b1112451ac64b4eae2f81cc05af5857.pdf?index=trueIn PDF document text
    • http://radiviwix.onlinewebshop.net/kerawamewugibo.pdfIn PDF document text
    • http://poriroviso.rf.gd/propresenter_6_not_responding.pdfIn PDF document text
    • http://zutotakome.epizy.com/xabaxuratuwuwifotabik.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_54d061206e57473cb8e67297d889e781.pdf?index=trueIn PDF document text
    • http://bikaxubu.rf.gd/filipino_to_english_translation_apk.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_ecb8c75b765d4396804d0f944c194e3b.pdf?index=trueIn PDF document text
    • http://felubefetixiwu.rf.gd/67440409609.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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5012 bytes
SHA-256: 9917ca754b745af5ec153a881730c7e2bd0907af8b60af99c607848c57f64c36
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10708 bytes
SHA-256: 9e24127f149b3733f6c93cb23c71dd8d9ec3c50718018a07e238b10f93b6e0a4