Malicious PDF — malware analysis report

Static analysis result for SHA-256 146fd2f67fc2a59d…

MALICIOUS

PDF

88.4 KB Created: 2021-03-29 18:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b7d879ca02bc7ce243b191f2100036f7 SHA-1: 6528111f00569e12e2b341ded6ad927b425453f7 SHA-256: 146fd2f67fc2a59d5d933ee71d720e64018993fea6ab81ce001256dd353bc7fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a primary focus on directing users to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF's structure and embedded links suggest it's part of a campaign to redirect users to malicious sites, masquerading as search results for legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=oxford+word+skills+intermediate+pdf+online PDF link annotation
    • http://mowefopovog.mywebcommunity.org/relation_between_electricity_and_magnetism_called.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_604d0ad4cff66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_604f02731c59d.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/79089705024.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/37598895648.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/catecismo_infantil_de_westminster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_60048a5066621.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/basic_concepts_of_physics_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5ffe7219bd7df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5feced261ac30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd19ba8-2015-4eed-b4a9-c12f5f847b68/arris_tg852g_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14fbdc0-f41a-4f98-ad47-af8e08955267/crock-pot_4.7l_digital_slow_cooker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/selenium_eclipse_tutorial_java.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/how_to_thread_singer_66_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4bf1a6-6b90-4e85-84ac-9f9eb5a5e844/mbti_compatibility_types.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/xosazugoxiguzekixofijizad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5ce527-a4cd-4dd9-ac2d-85ce7119a8d2/it_is_characteristic_of_robins_to_build_nests._this_is_an_example_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c42c8-44e9-4935-8782-9e6e43a898d7/18046992757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2279227-9aad-4520-b1e4-b9a4e380f3dc/karr_alarm_refund_honda.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/zexozuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32183bd-a9fa-40f9-8dd8-3e4eb5846806/movie_review_worksheet_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d6ec32-0e7f-49e9-95c2-beac43393e31/30398650461.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/snyder_performance_engineering_carmichaels_pa_15320.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000125fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125FE 26220 bytes
SHA-256: 7c4de5a93d161b69ea962cdedb3a9587e2b6892c48ed22eb347a53bad0563d1c
font_00_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5436 bytes
SHA-256: dafa59a72da9d2fd4b211a993ac8a0049a00e3ee28f7731a4455b2e540be876c
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 11064 bytes
SHA-256: 2a15cf48144f6cb0ec302f809bed947e5a6bb79d49ef62104a299b5a36e9b0d2