Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d6ba4a92c94f02…

MALICIOUS

PDF

97.4 KB Created: 2021-03-11 12:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 657f63beafe149320c01d3103604b4bb SHA-1: 965e42950f5a3241b50704718e428ef74fdde871 SHA-256: 31d6ba4a92c94f021b66877a37098cd33b6ae1870dd4f1b48c52e5ff0e8bc0bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/123?utm_term=android+architecture+components+with+retrofit PDF link annotation
    • http://lisojuribopuwad.22web.org/sad_break_up_status_video.pdfIn PDF document text
    • http://sabudunujo.22web.org/screenwriters_bible_6th_edition.pdfIn PDF document text
    • http://zufonedisogaj.iblogger.org/how_to_calculate_net_income_after_taxes_in_accounting.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/8hf5jgO/ideas_for_ping_pong_trick_shots.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/mcdougal_littell_modern_world_history_patterns_of_interaction_teachers_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/IgiYjhz/votejatefuki.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/ojgjcic/67135786026.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/jubabepegokozudaza.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/iDdhjSg/the_third_day_episode_1_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/mhi7zK9/dinosaurs_vs_aliens_tv_tropes.pdfIn PDF document text
    • http://wodesutama.iblogger.org/patriots_football_schedule_2015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9701bda3-ca8b-4e11-80f2-6880a6f6a6f4/the_missing_season_2_recap_episode_5.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_57f232cbb70c41a6a8ee6b53e5535190.pdf?index=trueIn PDF document text
    • http://bufiziwo.rf.gd/44198043913.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_3dc66e04d02542639206aa8e5c86d66e.pdf?index=trueIn PDF document text
    • http://diruben.rf.gd/is_dd_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d0327d-0de8-4848-b816-a3e525550c65/74956852370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959ec74c-dd0f-469c-a177-6eacafe5cc47/vafelajogavikijolep.pdfIn PDF document text
    • http://lufusemeg.epizy.com/krups_novo_964_dichtung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d5936d-70c6-4771-aaf1-54da2e114e41/ludemob.pdfIn PDF document text
    • http://veputowiki.epizy.com/boogie_woogie_bugle_boy_song.pdfIn PDF document text
    • http://mixaluximivis.epizy.com/dizaxitagaretumuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2217db14-3770-441f-91d1-0509a4c61373/87165952583.pdfIn PDF document text
    • http://sabinozugi.epizy.com/pamafukefusuwokatunaxix.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_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 5444 bytes
SHA-256: 4e46e451d9928017a19d7cf54dc65adae16c0f2a4f0b265a2121c0d6ac4d443b
font_01_sfnt_off000150da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DA 11448 bytes
SHA-256: c5d8ca0da39acdb2e799cca7c799c31ba7ff355a915821ba74bbd3c35263bccf