Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdabfbfbf6d57e69…

MALICIOUS

PDF

77.0 KB Created: 2021-03-13 23:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67c054f9650ee7beaf39db8757073426 SHA-1: c56598579a97e688c26b6ccdc3d2fe433de331df SHA-256: fdabfbfbf6d57e69dbebe303d0531e9023032f39a907c1397d671fa118a75240
186 Risk Score

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 6

  • 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.
  • 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://zajinet.ru/123?utm_term=length+metric+unit+conversion+worksheet PDF link annotation
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/4255902.pdfIn PDF document text
    • http://idealslimitaly.site/dodge_grand_caravan_overheating_problemsxlmd3.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/hNpgdhb/92676166946.pdfIn PDF document text
    • http://peskomment.ru/966628105834dasp.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/DghAuGJ/esl_placement_test_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vesotadenogo/bjiLjjT/mmx_hill_dash_2_hack_download.pdfIn PDF document text
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/togikeweru.pdfIn PDF document text
    • https://dasowafajego.weebly.com/uploads/1/3/4/7/134723411/790291.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hjegdhb/american_movie_box_office_top_10.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/18323eca3363.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jchia19/vozuvajopuduser.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/gfXggUS/jemuwirovadodemodisavubo.pdfIn PDF document text
    • http://netewe5.xyz/gioteck_vx_2t88ra.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/fuviluta.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/Jjfgejh/netflix_series_dark_season_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e42bda69657a4785864e977c2b08e586.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_6eec2c8821024914aae12c46099e9e3c.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_a7b54060eb5141d494b1eefd98ea0624.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_74b40e0963e5497995157eb7905de36a.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_65e4e4afdf37427c9b3ce61baf9790dc.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7a4bf663aaaa4a338813f925a1ece767.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_8407267c91c748d1a5c07e56c4422c98.pdf?index=trueIn 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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 5128 bytes
SHA-256: cef26bea7de4f653b967b5eb0ad79f408552b86536a8e4686d0799835488a4c6
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10504 bytes
SHA-256: c5d8ff275f2c1e2820bbc6caf58bf86cd02b5912fc144d77759181a69af140af