Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c96d69d36761b2…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 18:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24bb7b54e91a5f75275a680f29dd8c66 SHA-1: 9f8bb892167b7529499546287bd3e9cd1be31ab4 SHA-256: 61c96d69d36761b288fe36e28faff9afcb685893e2b144fa6e82778d64d85ed2
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 0.9998

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://jottigo.ru/wix?keyword=comprehensible+input+japanese+lessons PDF link annotation
    • http://creditscorerepair.info/bleeding_heart_moviemefeu.pdfIn PDF document text
    • http://itasda.online/rijeriromonuzirejaremirizgor8o.pdfIn PDF document text
    • http://usesalle.xyz/trading_options_for_dummies_audiobook88zum.pdfIn PDF document text
    • http://cccckkkkkdd.space/baldur_s_gate_2_single_character_guidem2ozo.pdfIn PDF document text
    • http://keysecret.ru/easy_does_it_idiom_definition62i3d.pdfIn PDF document text
    • http://vovality.club/1996_7.3_powerstroke_repair_manualcdin4.pdfIn PDF document text
    • http://ita-fitness.fun/how_is_macbeth_in_the_beginningw9wsv.pdfIn PDF document text
    • http://lavkavkusa.store/project_management_professional_certification_prep_course2ak6v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2f1c036e2659439c81983ca170b675ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5dd1548-f813-403b-8ab3-4eb25ffac3d7/dufunofekupemajekirunib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5988b551-51df-4e61-8fdb-602e181fadb0/sat_scores_2020_college_board.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/olx._uz__apk.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_8a78eed9fa7d49bb83824d0d6e43486a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e85364-6807-4088-8730-5ccb335f1fc9/how_to_use_viper_remote_start_on_manual_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aed6c8f-a8b2-47c3-a1d4-ae6a81095982/mexoledeteteligi.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/34807623385.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/41838062552.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/nujoweroduj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 5860 bytes
SHA-256: b6b5fb70288ee3628da24cd3140ac7e89f417af8d517d4cc187ebea3b346537e
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 5180 bytes
SHA-256: 6258e618257963ba47a0c2c93474c85f8ee18c23516ca4f873a740d91faf66aa
font_02_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 11052 bytes
SHA-256: b6bc98e9c2f33b360c68d23b5c47d2e99ade9163ad3d18127b91e0f10611d273

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