Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41c12667aa8a74d…

MALICIOUS

PDF

86.1 KB Created: 2021-05-23 20:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d3c4f6d4bd90507d137317ddf9225e8f SHA-1: 470db409c4215bc545b0d31a8b29a99bbea06a08 SHA-256: c41c12667aa8a74df69955d7cbe47e8e6aea6ce3df0d47f1b89ec61f77bb6752
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=paginas+para+descargar+peliculas+utorrent+gratis+en+espa%25C3%25B1ol PDF link annotation
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/6934022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_6058b75b0ece1.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/ruvufimux-xagivazelotob-rivenona.pdfIn PDF document text
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/478bf80c.pdfIn PDF document text
    • https://polopiwej.weebly.com/uploads/1/3/4/3/134353222/1531169.pdfIn PDF document text
    • https://liroxinumapidaz.weebly.com/uploads/1/3/5/3/135348088/tilonevetifadijob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_605b90943204e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ffcb89741c15.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/b5468be3-4e32-4b8b-bb35-49e00b5070f8/how_to_burn_3000_calories_a_day_by_walking.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/belle_de_jour_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/lokibitiwunupid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c737caa-bbed-43d9-bbd9-08460d8dbca3/valovepomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4eb121-ef96-443a-96ed-3df82fe16b95/28042612804.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/nature_s_answer_sambucus_black_elderberry_extract.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/lidofizobelawosega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59854a30-1190-47ea-9e5c-af7ae85e0267/classical_conditioning_theory_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8782e7b-7ef5-43ad-8aed-e3f281a8f08d/85891421684.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/52079147971.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/out_of_office_template_professional.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/why_does_my_monitor_say_no_signal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5452 bytes
SHA-256: 2809e81d9db27347f9f8f18b59258ac400dcd8114711a6d18739ecda5f6907b0
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 2252 bytes
SHA-256: aeee9b2fd577c594ede074a7e3493832e024aab8d381a7c1d16527c2e435dd06
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 12540 bytes
SHA-256: e26f33492906d81af7f9f007bca02c80f074a7e1f6af073dc8b1fbc7bd5bc208
font_03_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 16312 bytes
SHA-256: 8809a3cece76fd7d9af43fde8c647cb8a817fbc28d8352630f7114edff4066b9

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