Malicious PDF — malware analysis report

Static analysis result for SHA-256 5618502f9c1670d8…

MALICIOUS

PDF

88.6 KB Created: 2021-02-21 17:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4668075cb0cf04bc1a79ed24e8cf34c3 SHA-1: 2cf194cba3ec331605b61c75500c53d424bac720 SHA-256: 5618502f9c1670d803ec3947fb9c20c88880836d66f10e7abb8aa9e525aff35b
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=chestplate+enchantments+1.16 PDF link annotation
    • http://tupakewufitid.iblogger.org/psc_omr_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/hjOhaOg/59327690975.pdfIn PDF document text
    • http://relejovavup.22web.org/how_to_repair_water_pump_motor_in_hindi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_60148a3f5dc89.pdfIn PDF document text
    • http://lijamerogavex.iblogger.org/aaranya_kaandam_tamil_movie_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fd264b811742.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/fhbghaO/cricket_live_match_score_please.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/h51ohdv/dutadabona.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/CjebYSf/ates_ve_su_5_rekor_oyun.pdfIn PDF document text
    • http://lepasipun.iblogger.org/38289212114.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6GdCXv6/16237153645.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/4ggjaih/8208196665.pdfIn PDF document text
    • http://wokelegekak.66ghz.com/wozomibibusaxijawuteta.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/TWigx9B/dawizizin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujejuxuj.rf.gd/nazuwagedefikena.pdfIn PDF document text
    • http://jenetaponolinev.rf.gd/latest_weather_news_report_philippines.pdfIn PDF document text
    • http://reniletaz.epizy.com/94460831348.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/potential_transformer_testing_and_commissioning.pdfIn PDF document text
    • http://bilodevufutumu.rf.gd/13329665686.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 5220 bytes
SHA-256: 875c70d88da3a404f208c73161906e385e4166e98880813af74ef00b974118ce
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 11128 bytes
SHA-256: 17649a9427b08560a32ab3783ab8f850f302b339b08478e1ec3c7c372913aa8a
font_02_sfnt_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 16104 bytes
SHA-256: c72ca0970d51b0a8ad78cefeb5ce5696832e14da31bd2128a4ba9c3d04a16bf4