Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b5ef5edfaadaf…

MALICIOUS

PDF

82.3 KB Created: 2021-05-25 06:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34679f85c3fb0efc794fdd9ae186743f SHA-1: dcbb0bc9f0b9d390ec9094d88b8396cc95f6e8f3 SHA-256: a77b5ef5edfaadaf39726774ff7193d1ccd1abd4d2d4c267c4fe66882310c2ea
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 0.9991

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 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://maypoin.ru/strik?utm_term=curso+mecanica+de+motos+gratis+pdf PDF link annotation
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/fuxav.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/sozufen-supejuvu.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/2002383.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/448826.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/vozunibezad.pdfIn PDF document text
    • https://mukoxajajow.weebly.com/uploads/1/3/4/7/134719184/bumuveximilebibar.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/tolikozuxavuriwexo.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/rulorovuwalun-mulav-pamizifumo-pomigu.pdfIn PDF document text
    • https://zazibarem.weebly.com/uploads/1/3/0/7/130775746/karodara-komezozirujakoj.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/nagedarozagabej.pdfIn PDF document text
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/7036802.pdfIn PDF document text
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/dotebomanajuvideteza.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/ba989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/44375764330.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/9th_grade_algebra_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/39487063199.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/68798977812.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/96662515794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267a47f7-28d0-4477-97c7-2c5170711e43/what_are_good_makeup_brush_sets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0afcf2-8197-4648-84ea-2cc7e96967c8/basic_engineering_circuit_analysis_10th_edition_by_irwin__nelms.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/12275558948.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/nikon_coolpix_p510_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/lagu_percaya_aku_chintya_gabriella_wapka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5620c11a-9fc9-44cd-8a7b-eb8d512a6e7a/how_do_you_thread_a_euro_pro_x_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aaa93e1-9a04-4be1-b6ff-78dba800e42a/jiwewaderanugerirapaji.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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 5348 bytes
SHA-256: f95016028fe9de99c55540ae8ab97b75cfa2c19b373b9811dc2f3985c8730f0b
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 13596 bytes
SHA-256: 444c32d1b0fc8d38aa1602e4336a2054983f97560859bada0a111f61f7de576d

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