Malicious PDF — malware analysis report

Static analysis result for SHA-256 2629cd260390df78…

MALICIOUS

PDF

77.1 KB Created: 2021-02-15 19:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 733d6b39dd3d5ea8d4e77bd436ed627e SHA-1: a3befd880b78e86f36e96c234828264e0380be4c SHA-256: 2629cd260390df78e394268d8d570967748527efd4a4ed67a67e5a9b27b8e627
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or spamming lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=what+is+metamorphosis+in+science PDF link annotation
    • https://cdn.sqhk.co/kewawukufiju/javiiGd/36755563586.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/icr9M4x/runescape_spirit_weed_seed.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ahajagg/download_jw_player_videos_android_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fd0fc217227c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fd7860befb13.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/Ngngcgc/weapon_mods_for_minecraft_1._14.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/contingencies_and_commitments_balance_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b467eac0c3.pdfIn PDF document text
    • http://myfoxing.online/seccion_aurea_en_arquitectura_defini796ey.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/hhjjjha/rutumuxusidibujekul.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/ugjied8/33766147162.pdfIn PDF document text
    • http://fuluvil.iblogger.org/70254676148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fcc6080564b4.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/fsia6hc/friv_minecraft_games_online_free_play.pdfIn PDF document text
    • http://igme.site/8832094421sm11h.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/1hahc8Z/senew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/puke_face_emoji_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/picsart_for_windows_7_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/10th_marksheet_verification_up_board.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/nclex_midwifery_questions_and_answers.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_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 5152 bytes
SHA-256: b78fa3736c4f8157feb3886beec400b5fb4a5e4f1be1a858c0d5fdc2dad05aa5
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 11036 bytes
SHA-256: e9f91487374e92d41d01fe1b5453416e80268fee872471f0954be36a3e7161ba

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