Malicious PDF — malware analysis report

Static analysis result for SHA-256 285486fe885aa9ea…

MALICIOUS

PDF

71.9 KB Created: 2021-05-13 12:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ebc7fb85791f94ff4f0c9ed6aa25fc6c SHA-1: dd3a7dbbda5520fc277d507d6506aeff0b46537e SHA-256: 285486fe885aa9ea5fceab9a5152dedcb67b7411bfefad6d25fc703ad7eec6d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The primary URL, 'https://midufefew.ru/strik?utm_term=lg+inverter+v+troubleshooting', is presented as a troubleshooting guide, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=lg+inverter+v+troubleshooting PDF link annotation
    • http://lupepujalin.iblogger.org/pipupekopipumot.pdfIn PDF document text
    • http://agencymedia-ig.com/midrash_rabbah_exoduspuk63.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/appsc_group_1_new_syllabus_2020_download.pdfIn PDF document text
    • http://azorocheat6.xyz/dexabojobidezikepuvegiic3n1.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/refufafofalubofokidotu.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitokobu.rf.gd/vewatovebureniduralep.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/why_did_the_spanish_establish_missions_in_texas.pdfIn PDF document text
    • http://dupumimegijema.epizy.com/lock_pick_set_auto.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/accelerated_reader_ar_quiz_answers.pdfIn PDF document text
    • http://gozipoxux.rf.gd/bein_sports_tv_guide_saudi.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/92752324933.pdfIn PDF document text
    • http://puwagof.rf.gd/diagrama_de_flujo_significado_de_los_simbolos.pdfIn PDF document text
    • http://pamemoroza.epizy.com/44697643026.pdfIn PDF document text
    • http://kanisal.epizy.com/mipatevomikabubikepo.pdfIn PDF document text
    • http://radosal.rf.gd/84557664961.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/gosifogenetag.pdfIn PDF document text
    • http://retinibefefemo.rf.gd/26467003551.pdfIn PDF document text
    • http://mutupoda.rf.gd/99957860905.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_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 4876 bytes
SHA-256: 77fdc9df6bdcec3ee4b5ce2353eefa57f6f262f3079b9a68157b9abf960b01a1
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 10452 bytes
SHA-256: 590bb15af411b93c131da9de8ab673bbef5b377bfc7e799addf00cc612bd6883