Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de14bd86f8c4ec…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 00:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a5923d4580f823987b5aa5e668545eb0 SHA-1: 53cb420f338d879fef75f6ddfc639a6a972392fc SHA-256: 05de14bd86f8c4ecde77e981c8fa332ee0bf4c1e18dd2a579ff2f8315602394f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is vilenefex.ru, which is presented as a search result for a dictionary PDF. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=britannica+visual+dictionary+pdf PDF link annotation
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/787799.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/5131894.pdfIn PDF document text
    • http://tevazodufo.iblogger.org/supportive_leadership.pdfIn PDF document text
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/1556468.pdfIn PDF document text
    • https://rinalodejivew.weebly.com/uploads/1/3/4/3/134383373/664e032.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/7e94cd6a-4095-4e3e-89b4-67b2faf08099/waters_of_babylon_song_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8078e5e7-7d8a-4750-b924-ab5746c48bbc/72510706356.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_928bbadd9b254c6e974291e79836649a.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7cc58e6252f64d19b3234ce92de11518.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/camera_360_for_pc_laptop_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/baby_shower_cake_bunting_template.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_32d5f4323ea84864a37e613088b50b01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc98cbb-e3c3-48d1-b14d-37388e30b601/44970092484.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/cranial_nerves_list_and_function.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/30mm_cardioform_device.pdfIn PDF document text
    • http://wemoragi.rf.gd/mixiten.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/sejujob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8f4fe9-391c-4b83-bc85-f2c4b5d391d2/relative_clauses_worksheets_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/94752467229.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/definicion_de_calculo_diferencial_libros.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5360 bytes
SHA-256: 04bdf98d69c3a4d32e946ced53ed51cddea3758d6904409856282636f51e8f0c
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10568 bytes
SHA-256: 8df310db14004cbe0a352be021320bb5b075a120a5dc0626db137d6d24f3926d

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