Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dba997cad1745b…

MALICIOUS

PDF

94.0 KB Created: 2021-03-15 04:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 80e7476fa90cd55263a1a6b93b33fdcb SHA-1: b7cb6c10532e2d765e804beb46765078709199c8 SHA-256: b4dba997cad1745b972801bbe0a5e9e0d5725847abf50e479baa070cd7b70ae9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/123?utm_term=best+career+path+for+manual+tester PDF link annotation
    • https://cdn.sqhk.co/tojorovexuw/59UchhU/alita_battle_angel_songs.pdfIn PDF document text
    • http://bokifov.iblogger.org/how_to_rehab_ac_joint.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/dismissal_form_template_south_africa.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/9242012.pdfIn PDF document text
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/8710047.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/eYiavgc/62981397032.pdfIn PDF document text
    • https://cdn.sqhk.co/sikozejaxed/zYhd5ic/camera_360_android_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/jonilinenuvo/ShgmieD/how_to_install_pax_app_on_iphone.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/mofuvas.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/bcf13967a.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/5370078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_21458ec4e82140ee8ef26b11cd3d8baa.pdf?index=trueIn PDF document text
    • https://6bda1257-ae7a-4fac-840f-d5dfc178f195.filesusr.com/ugd/f4de5e_cc1858789eaf4fd5959b7cc67e3bfa9f.pdf?index=trueIn PDF document text
    • http://xatalugatavu.epizy.com/aircraft_mechanic_school_in_usa.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b50eb7d0f72d4c6b8ca2bf61a0ae29bc.pdf?index=trueIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_3a70df75da63438a90b91a5e887861ab.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_c66d9315aa2540a2a99a9b464121698c.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_99d50f0456154678986dc4c85f5380ca.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_9e77e4d8d69840ce8b99cc6030c66893.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_43b11bed617243c6986c8483a634c6d7.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_ad01dfe223c04903ab56327fa78d1532.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_5b45ab62f9de4adea69a9c6e917d121d.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_c6adf2387b2d45dca93ef01447f699b4.pdf?index=trueIn PDF document text
    • http://tilixufevoj.epizy.com/cinta_luar_biasa_cover_reza_darmawangsa.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_27c81538b30f44368d7a79a9ff452f08.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_off0001343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 5304 bytes
SHA-256: 6fbb97895db0c985373de10913245a7aed0faca89b80f866d4a3258480dcd0a5
font_01_sfnt_off00014621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14621 10676 bytes
SHA-256: 538737826950e7bc4fb9ffca90d5e0a9dc4f479743d0bdd47c610fd0babb15aa