Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7095deef3a0a3d…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 12:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb62fc20b2ef5a045554fb16524fb70d SHA-1: 126de4cbffea732369c39dac70edaa4f034afd44 SHA-256: 3b7095deef3a0a3d7cbe403714a34ed64f2f41af215a6e58e0f3db6c06d8c725
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 0.9998

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://jacksth.ru/wix?keyword=osrs+recipe+for+disaster+dwarf+quick+guide PDF link annotation
    • https://cdn.sqhk.co/jisaside/gwKgfNJ/cooking_food_fever_masterchef_cooking_games.pdfIn PDF document text
    • http://kittyplay.online/hemkosh_assamese_dictionaryrzfz2.pdfIn PDF document text
    • http://cmb-societe.com/pannes_diagnostics_auto90htp.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/gjihcgi/besijesosegegixinabiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/8lggifH/tapsnake_virus_removal.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/2605606.pdfIn PDF document text
    • http://maykistore.ru/what_should_a_receptionist_say_when_answering_the_phone24p3x.pdfIn PDF document text
    • http://todayshop.website/15744321709nh2yi.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/bokatedopazena.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ggjbhac/kotoputa.pdfIn PDF document text
    • http://ashotik.space/vadedewuvalajagaguxudnre.pdfIn PDF document text
    • http://dnepr24.info/42894891220220bd.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/gjhsgh6/carnival_city_s_nickname_crossword_clue.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/jupudizadid/7._snf_appearance_and_personality_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/anyway_you_want_it_glee_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/ielts_404_reading_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/sense_and_sensibility_lucy_steele_character_analysis.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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 5600 bytes
SHA-256: 3eaecec5c9268e4a25d59b60ea932149f49082fe7f07cf9e5c99f40ed40763cd
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10340 bytes
SHA-256: 97801f18c2824f3ceede6bee54789f485926f8673239aa23959690d35b46b293

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