Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d0dda64e91494a…

MALICIOUS

PDF

83.5 KB Created: 2021-03-19 09:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4103836e124d6a24fcd9613c09a60734 SHA-1: 68f5694d06379be054b6642589d3fca58ded5ecb SHA-256: 71d0dda64e91494aff59dd4a563c5838d71f1bc06f99e8325f287a083d2d0d54
126 Risk Score

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 pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to nutrition information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/123?utm_term=chocolate+covered+peanuts+nutrition+information PDF link annotation
    • https://cdn.sqhk.co/vupapevixu/fjhghse/cat_playing_xylophone_apple_ringtone.pdfIn PDF document text
    • http://kmikaerfs.ru/2095505690368oms.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/the_boy_in_the_striped_pajamas_chapter_7-10_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_602bfb7814ef6.pdfIn PDF document text
    • http://subonus.ru/tazuteahdg5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fccee9cf2e41.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajura/Uij4Qhd/free_avg_antivirus_for_android_mobile.pdfIn PDF document text
    • http://italywom.space/184397312060jy54.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/xofexixaregatuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_6010f99259160.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/what_age_high_chair_until.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hfXVpje/93724886692.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/L5hfPhf/49774506392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5fcbde56e012e.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/nth_term_of_arithmetic_sequence_worksheet.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/32085794500.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/fdvgdhe/off_road_racing_parts_australia.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://uploads.strikinglycdn.com/files/0830018b-6519-4cce-9f61-7b9a45d5a2f6/8745600758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28449530-1231-4942-9569-1d033aede1e3/what_year_is_today_in_julian_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1ed577-0677-42b1-8a85-c40e153207c1/hp_pavilion_27xw_27-inch_full_hd_1080p_ips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350ce0ec-aecb-46cf-b3d5-b74199f3368f/bimama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352046fc-8fb0-4776-8f70-cf7b4b55bdb8/position_of_english_as_a_second_language_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5b5505-da40-491f-b4ff-4d5691d3686f/fadub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470d4d88-42c4-4377-b918-31dbe7d8c8dc/central_and_peripheral_nervous_system_disease.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 5360 bytes
SHA-256: b5311f27b53bb04aff1b39915bcdfa32f7333112d48eb9461c0c9c4b70daaef0
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 11116 bytes
SHA-256: f995605bfaf04e208b0570453bfad4d2a4609ff8971301aa173ace8d48a0474c
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c