Malicious PDF — malware analysis report

Static analysis result for SHA-256 55195bac5e86dae1…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 15:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 469ab70c43d7dbcd6818a7f1c421df47 SHA-1: 9cf5f73773d0b5b1343cece16254005a94df40cd SHA-256: 55195bac5e86dae1e4ae00edc4a658cf8a1cc440875009784ff3d5cbe2596a96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://dugedepap.ru/strik?utm_term=how+much+does+a+minn+kota+terrova+weight PDF link annotation
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/3785119.pdfIn PDF document text
    • http://bonifacy.site/cloud_computing_company_in_usast4eu.pdfIn PDF document text
    • http://piziguto.iblogger.org/how_to_be_miserable_summary.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/keniwuzima-regawazeze-koborevebadum.pdfIn PDF document text
    • http://1xbet-registrat.site/592897977691xroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwuleraxukopiz.epizy.com/62113940409.pdfIn PDF document text
    • http://zurinelu.epizy.com/47688162933.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/tawosozezomo.pdfIn PDF document text
    • http://zunerewema.epizy.com/samsung_wa45k7600aw_a2_not_draining.pdfIn PDF document text
    • http://xojixitutatafu.epizy.com/romeo_and_juliet_2013_full_movie_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/dynamics_gp_2018_installation_guide.pdfIn PDF document text
    • http://tevedelowudori.epizy.com/kubozezutaxefebalul.pdfIn PDF document text
    • http://fewanepuwigox.epizy.com/fomaje.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/firebase_dynamic_links_android_tutorial.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_2e4d7ce3fb4348c79cbdba7823df23f4.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_205e567593c64c6988fd2bf563673894.pdf?index=trueIn PDF document text
    • http://lazokobipas.rf.gd/fofavatavirojaza.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_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 5496 bytes
SHA-256: a2196416755780011f5db1726cf87bab06fb82af45d4e0fcf9b42772e1192c6d
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 11432 bytes
SHA-256: 6980730c22a2aafbc97f396c64ab6161b4be9406c736296e6e854451a6806382

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