Malicious PDF — malware analysis report

Static analysis result for SHA-256 668a2fc23cd9b7bf…

MALICIOUS

PDF

76.2 KB Created: 2021-05-21 11:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77eaccddd389ef1756ceb87ef4521d58 SHA-1: b111cd4c9802d195a96efc4f025679f491c985d5 SHA-256: 668a2fc23cd9b7bf21a628f3723433c931bb3201222a74ff62a2635d3fac5ccd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Bowflex workout guide pdf' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=bowflex+workout+guide+pdf PDF link annotation
    • https://lixibagiz.weebly.com/uploads/1/3/5/3/135348296/3119356.pdfIn PDF document text
    • https://meverelalopabij.weebly.com/uploads/1/3/4/1/134108836/kovigot.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/lixutovatu.pdfIn PDF document text
    • https://bugagage.weebly.com/uploads/1/3/5/3/135330359/pesixovoj.pdfIn PDF document text
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/3992904.pdfIn PDF document text
    • https://zokagigapo.weebly.com/uploads/1/3/4/7/134719336/f2b1231fa.pdfIn PDF document text
    • https://zulafadosulivi.weebly.com/uploads/1/3/4/3/134305332/fekize-puvojuxeba.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/1987478.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/rexogeguxosix/39200538626.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/25654649127.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/99008906207.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/tikuwekexesi.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/microsoft_word_mcq_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/dresden_files_wiki_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/76804209918.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/21632270308.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/55797942993.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/wd_my_book_live_firmware_update_stuck.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/81827778057.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/nz_fetal_doppler_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/pebupanufokimeworuxat.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/cuando_se_puede_viajar_entre_provincias_en_andalucia.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/kulowoga.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/cracked_spotify_apk_ios.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5092 bytes
SHA-256: e2c3190e13b6e27c1e58c7ba9adee7e7f5e1a744a3a39ca7c5a824abf8d96ee3
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 11028 bytes
SHA-256: 534de3000aed3f2ad0b651941c5484764ac6eac19f0c33d8188c788ab43f6520

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