Malicious PDF — malware analysis report

Static analysis result for SHA-256 546f97a6c183cbc4…

MALICIOUS

PDF

72.0 KB Created: 2021-03-18 20:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0a980aa5a68ca9334fd711e97b75a151 SHA-1: 58299237bc04212d74c7540c6f993c45b18d4340 SHA-256: 546f97a6c183cbc495be185b7139682de2be4f09b4376220f49a933f6a1c7765
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://nipisod.ru/wix?keyword=cover+letter+enclosure+or+attachment PDF link annotation
    • https://cdn.sqhk.co/mixekuwuvo/0jhjiGp/military_strategists_quotes.pdfIn PDF document text
    • http://marketop.club/wapogoxuprv05q.pdfIn PDF document text
    • http://sexesex.site/drum_set_parts_and_their_namesth8nq.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/ifBjhic/bajokunixav.pdfIn PDF document text
    • http://linza.media/16380553253x97lx.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/ifhfiiS/skooler_parent_login.pdfIn PDF document text
    • https://cdn.sqhk.co/gejemizus/aMDsiey/79561519556.pdfIn PDF document text
    • http://fruct.space/kidde_smoke_alarm_i12060a_manualtvm6x.pdfIn PDF document text
    • http://static-start.top/much_ado_about_nothing_quotes_about_honork5727.pdfIn PDF document text
    • http://topsalon.xyz/computer_organization_and_architecture_syllabus_ktux8018.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hljdhge/wedding_cakes_prices_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ihhjRXt/can_you_freeze_candied_lemon_slices.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/wuniku/78342535723.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/52949428269.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/what_best_example_of_heat_transfer_by_radiation.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/kabaloletetik.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/1962173356.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5004 bytes
SHA-256: 37d543b6d67b3c6e0cffc082e599d175d39adf6ff260c2686f3f91437dd32250
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10600 bytes
SHA-256: c0d3cf2391786f4f90271da2b724bf7a294b386c85281699a5d866a96e5e4b45