Malicious PDF — malware analysis report

Static analysis result for SHA-256 33361bb6affe1ab0…

MALICIOUS

PDF

83.0 KB Created: 2021-04-05 06:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38cd299c9bf8e4efc4776bd82e72a05c SHA-1: 894e03b966786954551ab242ee650867bcc8f895 SHA-256: 33361bb6affe1ab0c25849362064025ee305cc8e0e2e1d77fcabe5a5835b0b32
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. 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
  • 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.
  • 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://lozipotod.ru/123?utm_term=cinematography+books+in+tamil+pdf+free PDF link annotation
    • https://cdn.sqhk.co/lidupusumoj/jghageG/shooting_battle_mod_apk_an1.pdfIn PDF document text
    • http://bewugexujiz.iblogger.org/breakdown_structure_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/ejfhihj/music_affects_productivity.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/Q2Agggi/maze_runner_book_3_common_sense_media.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/hgNPFhg/jedeperabazigofamowu.pdfIn PDF document text
    • http://gikubozudunol.iblogger.org/recent_advances_in_food_biotechnology.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/jewG4jj/miditiso.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/cggX3hg/ripozebikaduxu.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
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_9df1e6744c824c3292f27d2584817984.pdf?index=trueIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_26d52fac03b646df8527b98dfdb190d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/all_cheat_games_on_android.pdfIn PDF document text
    • http://woloruvikato.rf.gd/rpg_android_games_offline_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/40084627484.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/billy_joel_storm_front_album_songs.pdfIn PDF document text
    • http://tumozuj.epizy.com/73605261881.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_beaf85f0a8e8413bbac861e722622992.pdf?index=trueIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_e387348398044127ac7888611958caf9.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_144f804593844bea92bec0f3b1f75b43.pdf?index=trueIn PDF document text
    • http://gelonixaj.rf.gd/what_is_conflict_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/57803011646.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 5572 bytes
SHA-256: dbe38573b770b25caf2f8cefc8f089aadc2de8c857d1ac970fed8621a0464223
font_02_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11232 bytes
SHA-256: 6025274aaa5bfaef920b0908a4e453c9e809f71a11b27c8f69fd1f6b412d23c2
font_03_sfnt_off0001302b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2