Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4a0dc4957c903d…

MALICIOUS

PDF

70.6 KB Created: 2021-03-09 11:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1bc66599b98e61273dae31aab0edc41e SHA-1: 581c91e389b542b9836e52f7f169050460f9bfd1 SHA-256: fa4a0dc4957c903da1e3c554cc6a3e0dafa4447fffad7f9d7a7da958184ae70b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, with one specifically appearing to be a keyword-based redirector for popular search terms, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/wix?keyword=suno+chanda+season+2+episode+6+promo+youtube PDF link annotation
    • https://cdn.sqhk.co/pibusupi/i4FbVgj/tofanubukusifufuwef.pdfIn PDF document text
    • http://getcreditreport.info/niv_thinline_reference_bible_large_print_thumb_indexedxk01q.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/hhYjj5z/lexevufedifulenidovok.pdfIn PDF document text
    • http://vvd.bar/nazusutejaxivezb7cpk.pdfIn PDF document text
    • http://sodahq.pro/yo_yo_fitness_test_measuresxew46.pdfIn PDF document text
    • http://daating19.site/43495534873nxlmc.pdfIn PDF document text
    • http://vuwazakuzasoz.iblogger.org/dedawamuvetorug.pdfIn PDF document text
    • http://milesnires.xyz/aws_certified_developer_study_guidefg7mn.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/jhgeBjg/the_walking_dead_season_11_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/ic6jjhf/blood_pressure_medications_that_cause_constipation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukedofabi.epizy.com/finesomijutavurokewem.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/rajibidutesijezar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76392ded-52fb-4c44-a8c2-64df0149d7dc/direct_band_gap_indirect_band_gap.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/cetusplay_4._7._6._2_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/double_bed_sheets_set.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/factorization_worksheet_for_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/defectos_de_tubo_neural.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/pimopuve.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/godizipadubaba.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/vawatexinezisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72169d4a-e875-4d9c-86ba-1d195bb3d9c6/31090236225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2183b0c1-35a1-4cbe-befc-d1e4f55df808/86680721932.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/anker_a7908_manual.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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 5912 bytes
SHA-256: 3c0a7bf316ced05c58c05a323c84dc71dc80ddf069517ec5a04dc31ee331ecc0
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10304 bytes
SHA-256: 30bc0081a09d679e0233f2c4a41fddcd7364e4e3a8e27aac5bd37b3fdd38cdda

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