Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e5eae61591394f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-16 10:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c443bd31869a81be436ca4fe96626a37 SHA-1: 145d27739bff256066d33f38e83db8253cbaa0ff SHA-256: 72e5eae61591394f68768c03c3c83bf6b23cf3eab60f04e989db43a493bf269c
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=attendance+allowance+ni+application+form PDF link annotation
    • https://cdn.sqhk.co/viliwogid/XmijTYm/active_listening_2_cd.pdfIn PDF document text
    • http://duxeluwezix.iblogger.org/rick_steves_ireland_guidebook.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/TRhiBt3/free_business_plan_template_for_trucking_company.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/wifjghd/baden.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/nvd2gjn/celestial_pearl_danio.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jdgcjhW/r1_ultimate_v2_nh-_d15.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/djbhjKR/12365012721.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/gixaxutedas_gukunelijis.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/YsiguhX/burger_big_fernand.pdfIn PDF document text
    • https://cdn.sqhk.co/jalegewiguw/LigV2FH/puppet_pals_2_android_apk.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/dutaxug_davaxiger_mafaluv_nenosoda.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/3529696.pdfIn PDF document text
    • https://paninopuj.weebly.com/uploads/1/3/0/7/130739529/f47f240803b.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/3184630.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/sotapofejoguxasemar.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/vuposemexuparopobudu.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/icJ7aVs/resapaseterivazonava.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hjPijkg/63781933194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonasekofuxix.rf.gd/chamara_ranawaka_pitakotuwe_song.pdfIn PDF document text
    • http://bumufir.rf.gd/banking_awareness_2020_study_iq.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_839a4d31b519497c85b642c6c590c466.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_8a18fb4c7ce8415ea27242fd148ed5a9.pdf?index=trueIn PDF document text
    • http://dedalumakur.epizy.com/quotient_rule_of_exponents_worksheet.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_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 5204 bytes
SHA-256: d072571ec30b9b6ea65e269257755ac4537406c29cd8d66ff46fc640702a9347
font_01_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10888 bytes
SHA-256: 07bc666582e429d075c4affecbab8436de4e5be2ccdde332016056f8136a43bc