Malicious PDF — malware analysis report

Static analysis result for SHA-256 d092f67580f459f5…

MALICIOUS

PDF

87.0 KB Created: 2021-02-15 06:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f921b2fcd4164989e25a796446506ef7 SHA-1: 982f7fdbed45eebb9c693de8c324fe8d74d79911 SHA-256: d092f67580f459f55a7022b94d7afbbd0a1583bb01d0fe41ab3be6229050c3e1
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://seumenha.ru/wix?keyword=fallen+leaves+book+pdf+free+download PDF link annotation
    • http://nisisigewu.iblogger.org/47443433073.pdfIn PDF document text
    • http://bitjoms.xyz/micro_bit_inventors_kit7oufp.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/jorosatosara_kibikomu.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/xopefag.pdfIn PDF document text
    • http://regse.website/509589738084o2kt.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/12311687399.pdfIn PDF document text
    • http://static-start.top/real-_life_discipleship_training_manualupzlh.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/121932.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/bubewadevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://novosumagib.epizy.com/bagdi_ki_rabdi_full_video.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/mizakitizibodinewamumoz.pdfIn PDF document text
    • http://tanofekomom.epizy.com/format_code_visual_studio_2017_shortcut.pdfIn PDF document text
    • http://mapureju.epizy.com/16402958715.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/85902611768.pdfIn PDF document text
    • http://zeraginijumeje.epizy.com/rima_asonante_y_consonante_ejercicios.pdfIn PDF document text
    • http://latowetutut.epizy.com/581522809.pdfIn PDF document text
    • http://kodexogezetegir.epizy.com/59587335597.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/finding_fractions_of_numbers_ks2_worksheets.pdfIn PDF document text
    • http://japaduvovudaku.rf.gd/despacito_violin_sheet_music_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 5004 bytes
SHA-256: 4a4e5f5ab2f1ba6a79e6e00388f552ca925bfe7827ace2f3629f35aeb41655cb
font_01_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 10648 bytes
SHA-256: 7f7cd530ebf2bed0aafb21c0458be7cb4585c5f358711a13fa92409bad1d584d
font_02_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3