Malicious PDF — malware analysis report

Static analysis result for SHA-256 7511d794d985eaea…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 10:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4d990da0812646f59ccfcb64362fed7 SHA-1: 5c686e3ac4f97636e94fbd4182bebd546cbfe3f2 SHA-256: 7511d794d985eaeafcc6b2937b8fd18e6a41f46a796eb7e89044e24ed962ec6d
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://kuzutuzo.ru/award?keyword=english+words+in+kannada+pdf PDF link annotation
    • https://cdn.sqhk.co/divoxisig/gieWjn5/bapozomaparofidi.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/iDHShPT/lock_screen_button_on_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hfrI7ih/infant_girl_halloween_costumes_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/fipakebeb/ihbWHji/63703377973.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/tichcgi/microsoft_sql_server_database.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/esiahj2/nekegawufutan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fcf45b4a9f52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5febd7ce47068.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/VohhJXo/rosamepebidozadilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_97bb6441f21c42bdb8e8904fa411f6e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/3334843050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a6c262-4cd2-4cfb-b467-115ffefd673a/panasonic_kx-tge234b_4-handset_landline_telephone_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/what_is_a_carriage_return_in_notepad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ba3f81-2afc-4072-b642-8b76bf6f8489/how_to_compress_an_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0819720b-7f29-4853-a1d5-0afc6c36a7a9/whirlpool_top_loading_washing_machine_repair_manual.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_5c76d1d6594c413b82cfc6bbfd9ffd81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e80a1c9-5d78-4ebd-9f86-21e7be6d5b9c/english_sentence_structure_exercises.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_f7c7a6e051c3472289c1a62a6c2addf3.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_bc3c057b9b8d4206b51746276e758412.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7b4bb3-ab1f-4375-8f39-2557fcfc9f50/sleep_sense_spa_essentials_robe.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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 5416 bytes
SHA-256: 2289049ce19ee4c47e64af426d41be887cb6528a8665d15b8e51df05b476f79e
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10288 bytes
SHA-256: 9cb4e533d616ec1315e49723cc810c3335b0fb06139e6e91c9806be616ba09c1