Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08355f19820842d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-29 13:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b81b2be7fa109c4cf38bdc3b2fe6da6b SHA-1: 0ee61c5635b36ff976ae69921d815ec5b66d6975 SHA-256: e08355f19820842ddd096b909294d9ceb1e7ea2e796179187b30f90f5eaa08d2
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 0.9993

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://crophysi.ru/wix?keyword=bose+colour+soundlink+instructions PDF link annotation
    • http://netekepipavosis.sportsontheweb.net/62657401286.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/spirited_away_one_summers_day_guitar_chords.pdfIn PDF document text
    • http://copyright-security-ig.com/84245957472ym7xw.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/qgix9wu/xabatatesuxu.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/how_are_humans_related_to_every_living_thing_on_earth.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/jjgjgvH/26850337709.pdfIn PDF document text
    • http://max-lifting.store/what_happened_in_after_we_fell1xj01.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/aShiib1/34570539145.pdfIn PDF document text
    • http://familyit.info/696238998594zpcl.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hijVXIy/font_angsana_new_upc.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/81902813179.pdfIn PDF document text
    • http://chisto-chisto52.ru/35697534189c5hxi.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/elements_of_safety_management_system.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jjmhect/switzerland_covid_19_cases.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/minabiwa/69571743700.pdfIn PDF document text
    • http://vutimeban.rf.gd/petsafe_1000_shock_collar_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/97177714653.pdfIn PDF document text
    • http://degibenogezegu.epizy.com/gerund_exercises_with_answers_for_class_7.pdfIn PDF document text
    • http://manovubiludigi.rf.gd/8261282694.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/types_of_capacitors_and_their_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/reporters_without_borders_ranking_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/crystalline_bjork_sheet_music.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/52771520606.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/26041159908.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 4836 bytes
SHA-256: 5570baddfdc82e60b628e2315c86b992e9109735f99075c95be31c4af96b0897
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 17124 bytes
SHA-256: b4afcd26348d297de3ce8dc5e5303fe081a35da4c58ac68d26452872196ac483

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