Malicious PDF — malware analysis report

Static analysis result for SHA-256 719cb9d3b9786430…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 11:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a5f4fc788182750772bc017ec631393d SHA-1: ccdb541acb7dd563d9fa6fcce1939a415e36d0bc SHA-256: 719cb9d3b97864303fcad052a4444d28c945344c44a5343996ebc0d6e010a2aa
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 0.9991

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://bologen.ru/123?utm_term=boogie+woogie+blues+piano+sheet+music+pdf PDF link annotation
    • http://siwosupegejolop.medianewsonline.com/all_creatures_great_and_small_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fee4237b95b2.pdfIn PDF document text
    • http://nopatoveji.22web.org/abolethic_sovereignty.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/Wdsgdkj/township_and_range_search_arizona.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/40169639788.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/gcqU7ha/63124204155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_603e6284dfc6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_60492604124d6.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/f3buUhf/10728057171.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/ijie96v/bidisofipa.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/is_blender_good_for_3d_printing.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/vobana.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/hIleicv/lemonade_stand_cool_math_games_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_8776584e9e0d40488fc4c54df87e329a.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_90d56e62bf8941b0908942fd935371be.pdf?index=trueIn PDF document text
    • http://jogukazulani.epizy.com/sheet_piles_purpose.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/convert_keynote_to_powerpoint_on_mac.pdfIn PDF document text
    • http://xubibufopude.epizy.com/8240982130.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_40635233d3e6466d9a5e9ba5edcdc09c.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_858f76a7088c4817bde623d22ea6cf46.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_aaa7096e40504e3d8f7acf14de8b2a7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/bulova_precisionist_chronograph_96b260.pdfIn PDF document text
    • http://rebivik.epizy.com/73824475117.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/dell_latitude_e7450_drivers_windows_8.1_64_bit.pdfIn PDF document text
    • http://jotikovan.rf.gd/tilulopikibebipow.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 5756 bytes
SHA-256: a99c9aa54f03284a12fb2ac08af20f5deadc1aed553dc9fcd10b8b637e2e4575
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 11156 bytes
SHA-256: e3604b69cb77f6ae7a570698c4ba3fe11af68d3aab02b00fd85c167ebdacfcc3