Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a83c3202796205f…

MALICIOUS

PDF

82.5 KB Created: 2021-05-06 23:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 928d992383977d54659a4f3c164ef926 SHA-1: 131f9497e49a61e847301f74f4de16d29390081e SHA-256: 0a83c3202796205f658ae8a5a38d7b692981c0a0842cfa23fd2c5ad69a3995cd
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. It uses brand-impersonation credential phishing. 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rewojomivatal.weebly.com/uploads/1/3/5/3/135345623/780621.pdf.
  • 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://crophysi.ru/strik?utm_term=black+and+decker+circular+saw+parts+diagram PDF link annotation
    • http://damewumesigalut.medianewsonline.com/maloreviner.pdfIn PDF document text
    • http://falogexeraku.22web.org/applied_and_fundamental_research.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/36097315273.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/magisterium_3_ita.pdfIn PDF document text
    • http://bigpleasure.ru/tunowazefoxotuigtex.pdfIn PDF document text
    • https://rewojomivatal.weebly.com/uploads/1/3/5/3/135345623/780621.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jgiJid0/srpg_legna_tactica_mod.pdfIn PDF document text
    • http://trokot-shtorki.online/874258614706430j.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/56688141019.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/jgj3jdJ/jumuboxosafubu.pdfIn PDF document text
    • http://fuvusawomere.22web.org/luwogojijukagagenosafuda.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/66636799454.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/tiduwisoxok.pdfIn PDF document text
    • https://kazobutuzag.weebly.com/uploads/1/3/1/1/131164075/latejuw.pdfIn PDF document text
    • http://milesnires.xyz/lacrosse_atomic_clock_manual_w86111lszx8.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/factors_affecting_academic_performance_questionnaire.pdfIn PDF document text
    • http://ecoservice-vlad.ru/adoucisseur_culligan_avenewqkrgo.pdfIn PDF document text
    • http://xozonline.ru/edexcel_a_level_chemistry_old_specification_data_bookletr7tca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilibosukotijob.epizy.com/the_end_of_evangelion_song.pdfIn PDF document text
    • http://tuxefofoxomar.epizy.com/voxab.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/naxulotagabiwonirejesil.pdfIn PDF document text
    • http://webataj.epizy.com/reflected_in_you_sylvia_day.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_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 5596 bytes
SHA-256: 89a68826cc4d7ff1847fab49a149dc4c90b14f55f7a1b6d5b9243e0b58ea1a68
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 11656 bytes
SHA-256: 8cb2a6dabedf57111db9101cf077a408d57930dc9bfacf41cdd45778c4e92ff4

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