Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fe7f370694a0a7…

MALICIOUS

PDF

95.3 KB Created: 2021-03-24 17:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 209be218ed8b202930be40100e4525c2 SHA-1: ed245051592442c175981dfa2b6377133a33a1f7 SHA-256: b9fe7f370694a0a7f0007664f0310400d95ffb12b4a1addb0f6f78dfa534c228
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 0.9988

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://mezovuduw.ru/strik?utm_term=what+is+the+current+version+of+kindle+fire PDF link annotation
    • http://wide-do.top/international_business_and_global_strategyhuf5e.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/larosuwopomezotenorekrbxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_6023830535354.pdfIn PDF document text
    • http://masevetito.22web.org/26919203530.pdfIn PDF document text
    • http://reabook.online/free_product_brochure_design_templatevchtc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_60501ee909465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_5fe90af0ae085.pdfIn PDF document text
    • http://triple-doska1.club/creating_a_double_line_graph_worksheeti8nzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_600f03fb35268.pdfIn PDF document text
    • http://libertinemodels.com/vajatksaxq.pdfIn PDF document text
    • http://suletupi.22web.org/negative_and_positive_connotation_for_wet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ff23e7acb566.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/heart_broken_status_video_for_whatsapp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_603e744caa0b1.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/35c4a2b4-878f-4f0c-a6e2-34b481ba11a1/linksys_ea4500_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c51660-edd3-4b31-809e-42524476e4b0/what_star_is_1000_times_brighter_than_the_sun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9681e84a-2fb0-455e-8201-246bb301b43c/mivexidipagibofuxajuwaruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0568f017-a037-48e5-911d-e4517dcd0595/xuzijijopanelizazezeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f47631-b3da-48c3-9e4b-97e490667307/lord_of_flies_sparknotes_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2728e8-31cf-4fa5-a457-bb6cd5488565/what_is_the_preamble_of_the_philippine_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e1d900-0e53-403f-a61b-eecd1569edef/74191403377.pdfIn PDF document text
    • http://rifufogasuser.rf.gd/oracle_sql_queries_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bededa-d6ed-4914-88e8-a45c01c1d3ef/nexus_10_android_5.0.2_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ad9e6c-d9e9-4ea9-a063-0f0ac957a4f5/bifiso.pdfIn PDF document text
    • http://remabinamuv.rf.gd/how_to_set_up_a_rca_surround_sound_system.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_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 5248 bytes
SHA-256: 685dbb3d5fd85bddf1d67d8766281c0f91a9a8ead42afa96c0481051a6db3fda
font_01_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 11680 bytes
SHA-256: 8902767b5f25e07fa14dedd3c13b12af52e453f8bdd0cbb56c6476628b7a49a5
font_02_sfnt_off00015b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B62 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833