Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd50beb5d93658e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 12:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa497510041839a55acacaab3951109d SHA-1: 9976a188ea82c6d32fd0cd3fb82c3a77a7ac3902 SHA-256: cbd50beb5d93658ee581833fa6b59e7e4ce068dba466e321e18f7086879035c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9990

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://baarspo.ru/wix?keyword=covalent+compound+names+and+formulas+iii+answers PDF link annotation
    • http://timurberg.ru/90334813928jwqqb.pdfIn PDF document text
    • http://bigowet.xyz/the_meaning_of_the_holy_quran_yusuf_alijfieq.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/8535695.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/7e5405.pdfIn PDF document text
    • http://gmetry.online/16014845190zwjic.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/borges_ficciones_english.pdfIn PDF document text
    • http://witefuxav.22web.org/fibutupinowi.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/the_brothers_karamazov_fyodor_dostoevsky.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/rujifij.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/65311605642.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/153460.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/1224494.pdfIn PDF document text
    • http://passive-income.ru/415269993128hpft.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/346d1d39-0dec-41d6-a6cd-12f81b505866/vicks_cool_mist_humidifier_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/american_psychological_association_journal_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712fd0ed-c048-4ea7-8a9f-52190d11799d/quotes_from_in_search_of_sisterhood.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/vupojopirixemutifi.pdfIn PDF document text
    • http://gurevewo.epizy.com/fisevutefonikezevelituj.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/12590829106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e78c82-4a17-4c37-adf3-998ebd741396/what_are_the_three_types_of_human_error_identified_by_rasmussen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83eaa0d-a1bb-4ebf-8009-6d0edf9cc377/fuwetofixikodibegitesaf.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/how_to_easily_find_the_gcf.pdfIn PDF document text
    • http://puwagof.rf.gd/transunion_cibil_report.pdfIn PDF document text
    • http://relikebatusexud.rf.gd/vujizamabigot.pdfIn PDF document text
    • http://zazufazujinuzo.rf.gd/90458662948.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_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 5360 bytes
SHA-256: 5a8ed61ebd528ac6438490c3c4507002e731dd65d19722e4bc7d487313447bcc
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 11044 bytes
SHA-256: e8a27890b360982b7817171bde5034722421e106e80568461e25f26f208dc2be

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