Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb082595053821a0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-14 05:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6abcc1952a9bc1187060d1b079dd2798 SHA-1: 94c6079c0738cd93781a000ec55df030daf5f790 SHA-256: bb082595053821a0eb45261ace9992e7cc70c0d5252cf831a7a8c52d58953ea9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by directing them to potentially harmful content hosted on domains like midufefew.ru and cdn.sqhk.co.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=possessive+pronouns+french+pdf
    • https://cdn.sqhk.co/suwajipox/dbhehjF/fire_evacuation_orders_near_me.pdf
    • https://cdn.sqhk.co/fetumamuv/igqjijt/pig_piggy_bank_with_tutu.pdf
    • https://cdn.sqhk.co/lemusezilaz/ohi3gdM/talerim.pdf
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/a781747b788.pdf
    • https://cdn.sqhk.co/wimiwupo/jbEicrW/41141356703.pdf
    • https://cdn.sqhk.co/gasariba/dgdgZwN/who_dies_in_the_100_season_6_finale.pdf
    • https://cdn.sqhk.co/togokitaz/ggIKicq/detention_officer_jobs_az.pdf
    • https://cdn.sqhk.co/xenotami/iahbBgd/f1_playstation_2020.pdf
    • https://cdn.sqhk.co/felebamifuk/OhdRfii/score_counter_free.pdf
    • https://cdn.sqhk.co/riroxale/Zjg5qU2/zombie_defense_merge_td_games_offline_apk.pdf
    • https://cdn.sqhk.co/tirabipati/fYbjjhd/fagelogo.pdf
    • https://cdn.sqhk.co/wazilisiko/Njchbjg/blackstone_academy_for_the_magical_arts.pdf
    • https://cdn.sqhk.co/waxuniwite/HhehbaG/davigezepot.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/zerapemi_debovu.pdf
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/reponasapiv.pdf
    • https://cdn.sqhk.co/gojogefe/jiCPX6p/xiaomi_yi_dash_mini_camera_black_ycs1b18.pdf
    • https://cdn.sqhk.co/tilafukefuwe/xgfhfjg/molifiporosomubesowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purixifusipelid/dolezixalesovavuvugu.pdf
    • https://uploads.strikinglycdn.com/files/9f51c2ff-1e14-498a-91c9-dfaaf4199d89/leboxunagotizes.pdf
    • https://s3.amazonaws.com/ximupuv/wikononotusinega.pdf
    • https://uploads.strikinglycdn.com/files/91001cbf-4320-45f1-8173-61b70966ae22/xixududidefobov.pdf
    • https://s3.amazonaws.com/mipizaju/belgrade_nikola_tesla_airport_annual_report.pdf
    • https://s3.amazonaws.com/zemunomipazikez/railway_reservation_form_2019.pdf
    • https://uploads.strikinglycdn.com/files/91174cc4-f4c6-49bf-ac3f-f3416e4a6241/1995_chevy_s10_ac_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/d4f39389-0487-41e1-a6fa-0677fa38781f/8506357125.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_off0000ef03.bin
12bb879406094d0b72996da77b03624cb9dc3362ed31d10f878c7f3b85a3119a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5064 bytes
font_01_sfnt_off00010048.bin
c0a336d8b64cadac629ceeccc7fab4f4f7d723e4c8588983db371197d179cbf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 11760 bytes