Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb7a6d5cc94fbc6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-09 02:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 05790fdc9ebe2b49f5a9dbe9b55a47d0 SHA-1: b057a030e776d1581f07927822ef1aefa451b453 SHA-256: 2cb7a6d5cc94fbc648fed91a236e7990d772daee8c67b957e7b3c69d3e541472
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/123?utm_term=extracurricular+activities+film+parents+guide PDF link annotation
    • http://lnstagram-verificationbadgeform.com/tanabatas_wifebye10.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/bNUherR/mlg_flappy_bird_420_unblocked_at_school.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/polo_ralph_lauren_promo_code_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/cjgnbGz/freedom_weapons_mods_fallout_4.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/8058320.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/a9ihphc/auto_body_technician_salary_florida.pdfIn PDF document text
    • http://banki-internetowe.com/how_to_write_an_ebook_in_one_day304va.pdfIn PDF document text
    • http://sarhello.online/950664488406ymmj.pdfIn PDF document text
    • http://podarokinsta.online/apa_style_format_citation_machineiyilr.pdfIn PDF document text
    • http://digitalmedialit.com/719690015350829e.pdfIn PDF document text
    • http://netzamka.ru/rewafub8qte4.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/9048732.pdfIn PDF document text
    • http://sqrab.top/executive_command_mini_quiz_icivics_answer_keyo8sud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/ximijupuzezivogovo.pdfIn PDF document text
    • http://nugibupir.epizy.com/what_is_the_golo_diet_consist_of.pdfIn PDF document text
    • http://luvurukakun.epizy.com/safety_disney_movie_story.pdfIn PDF document text
    • http://netujodozovuda.rf.gd/pepijufebokakixeketa.pdfIn PDF document text
    • http://fusugesagovovez.rf.gd/gibiketewobebu.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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 5560 bytes
SHA-256: e6372a5776ff0ab8f4783fa9fb3b4c0052008f926729dca4f78e7fab644e7319
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10232 bytes
SHA-256: 4c6074ca9eea6a5dfb9a6606feec77b46546a13656417e62aea6ae5e72f3c0fb

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