Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d005261dfdbe7…

MALICIOUS

PDF

95.7 KB Created: 2021-03-24 02:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e943a34221f96fdb2dadd59ce66baac9 SHA-1: 4bd30f9ec356096f6bd8d801576de52da2eac71a SHA-256: b39d005261dfdbe747acdad17cd10e2b364d64de84c612a03e14ec64797131cf
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 0.9961

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://resalured.ru/wix?keyword=tv+guide+kenosha+time+warner+center PDF link annotation
    • http://wigogaduxatinuv.iblogger.org/48934063176.pdfIn PDF document text
    • http://boterilutonesi.iblogger.org/99267285356.pdfIn PDF document text
    • http://xekedibu.iblogger.org/thermal_nitrogen_oxide_formation.pdfIn PDF document text
    • http://tejajugumoneton.66ghz.com/9781922358.pdfIn PDF document text
    • http://sijufur.22web.org/exercises_present_simple_questions.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/15ef5769-d113-4f53-b585-6163a4161538/74584321106.pdfIn PDF document text
    • http://nanefelizili.epizy.com/csir_net_2019_answer_key_chemistry.pdfIn PDF document text
    • http://vakalugofiw.rf.gd/musemokigebujajaxe.pdfIn PDF document text
    • http://wokasob.rf.gd/sales_and_marketing_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c998885f-82b1-4bc3-89f9-a2efc67312d9/full_body_stretch_routine_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/voyager_legend_uc_headset.pdfIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_a2539964253c4a34989a95e4a95a1d38.pdf?index=trueIn PDF document text
    • http://kajoxuf.epizy.com/molecular_cell_and_developmental_biology_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a057cf-bb7a-4061-8429-038032a4be90/christmas_bible_quiz_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9ccb42-5323-4ba8-8e48-0d7332354000/1016416387.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/animated_movies_free_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/incident_investigation_report_format_sample.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/adverbs_of_time_activities.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_1c719066756947a09694c42cd33b1fd3.pdf?index=trueIn PDF document text
    • http://sasugokomelu.rf.gd/lake_superior_salmon_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/badminton_game_rules.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_fcf214205f154624b14dd4875af7d727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b9d821-f502-4d8a-abc9-b0a28abc7963/23960207784.pdfIn PDF document text
    • http://gozowivafano.rf.gd/tork_outdoor_lighting_timer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/invensys_pension_scheme_annual_report.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_bd7ba6949e8b4f18ae19d45d3db19f7d.pdf?index=trueIn 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_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 5484 bytes
SHA-256: cbd141f4649f7cd5e154f49be953721f1adccea5fcd6481745ae8848458bbc1c
font_01_sfnt_off000144a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 13712 bytes
SHA-256: 630f115e1fb0230876dd9efe4a69bc1c2b1a1dd6d6f8dcd91e47c5fcaaa03bc2