Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dcbc66afd0edef…

MALICIOUS

PDF

77.1 KB Created: 2021-04-25 22:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccea9d33908180fa5daa66bf48585b43 SHA-1: 34eb7865d57ec107957125ae15bce4380abb2d7a SHA-256: 07dcbc66afd0edefe1dfb6644b4db6fdfa2e354196fe6697b075a2b222271e3f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as search results for popular topics, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=harry+potter+book+1+sparknotes
    • http://itverys.space/how_to_make_simple_barbie_doll_housewbj91.pdf
    • http://tronreserve.online/rivaxodunalokinokagiigqa.pdf
    • http://azakalaza5.xyz/how_to_put_together_dirt_devil_power_max_petknc0w.pdf
    • http://sagelejupef.22web.org/pebumibagiki.pdf
    • http://lnstagram-verificationbadgeform.com/xasifewvmr98.pdf
    • http://trokot-shopnew.online/526015661868dzy.pdf
    • https://cdn.sqhk.co/rovifatira/LiaMVxk/kart_racing_games.pdf
    • http://romeoplanet.club/diary_of_a_wimpy_kid_rodrick_rules_full_movie_online_freep1yyj.pdf
    • http://jedusajinud.mygamesonline.org/how_to_calculate_solvency_ratio_from_balance_sheet.pdf
    • http://bitsracing.net/adventure_maze_mornington_peninsulagcbal.pdf
    • http://gufutaca5.xyz/39301203553xniys.pdf
    • http://ecosbor.net/3185792837gbs3b.pdf
    • http://reactivaperu-viabcpi.com/jagesexedupokogebgf8.pdf
    • https://cdn.sqhk.co/lakivasulis/jbidjiA/72975099569.pdf
    • http://remontnatali.ru/trade_license_form_chittagong_city_corporationtae6k.pdf
    • http://dedevolopi.iblogger.org/bascom_avr_help.pdf
    • http://philonio.online/practicing_the_power_of_now_audiobook_free4wp2m.pdf
    • http://topshops.website/presto_dehydro_digital_electric_food_dehydrator_instructionsr9v0l.pdf
    • http://medilawibume.scienceontheweb.net/85186207441.pdf
    • http://carishr.com/how_to_reset_a_vizio_soundbarlkaof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bozisiruvaletun.rf.gd/mesokogoletisozitikagivo.pdf
    • http://litasamixezan.rf.gd/46505476226.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef46.bin
1090f911ea557cf0be011343d16adeb4f60434ee47ab44b39e10c66ff815d223
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 5100 bytes
font_01_sfnt_off000100b6.bin
67c505883377c1999b832ecf84b0ce54c671509a8365158fd1b60fb6fd9b3599
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10816 bytes