Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb16af7c7a99f78…

MALICIOUS

PDF

84.8 KB Created: 2021-03-15 11:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 233db9d80c9dcaee54efdec53c891fbc SHA-1: 2744a74ad10a9e004fcbd3fed09009f7d2595ccc SHA-256: 1bb16af7c7a99f78e70a3c45d78e67f0b9503683d829f4de6abafe375232468a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to the document's primary function being to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=backbeat+fit+wireless+headphones+not+turning+on PDF link annotation
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/bda6b63cbf31c.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/eNVDd9P/microsoft_planner_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/age7qja/oh_baby_song_lyrics_from_malaikottai.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/afee40a.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/UpXiehi/cara_tukar_voucher_game_max_telkomsel.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/je2ibgs/imani_s_fafsa_forecaster_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jAgdgtk/1100_words_of_riddles.pdfIn PDF document text
    • http://sluzhba1.net/how_to_use_elegant_writer_calligraphy_markerc5rhx.pdfIn PDF document text
    • http://tryporte.xyz/precalculus_right_triangle_trigonometry_worksheet59zwo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/h72Sibt/sawimumadakeb.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/exhbXjh/jetpack_joyride_mod_apk_download_android.pdfIn PDF document text
    • http://yandex-delivery.cc/que_tipo_de_sistema_termodinmico_existen1m0xa.pdfIn PDF document text
    • http://mediaverifiedbadge.com/54779140098ow2wt.pdfIn PDF document text
    • http://mafibironido.22web.org/how_to_remove_brinks_security_system.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/agh64gf/poveximodonafaposetuzido.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/532401.pdfIn PDF document text
    • http://kdghy.online/hp_officejet_4500_wireless_connect_to_phonef21ds.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/43c70cd9-ab31-42b0-955c-f8478a5746bc/tuwugusekamiwubaravipa.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/52893998294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d12fb2-2759-4b90-ae1d-73f428f7568f/nejef.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/loninalul.pdfIn PDF document text
    • http://fegozovot.rf.gd/21178479496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113fbdcb-6c5f-4854-bdc6-b54df5d53024/how_to_know_if_something_is_a_strong_or_weak_acid_base.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_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 5760 bytes
SHA-256: 5b06cab22147e3ca04c956dca2936b8f2317ff510ba1d45c009d39276960e671
font_01_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 10772 bytes
SHA-256: 25bc57063c6ca52953ab95f0a3fd998bd2ea5b59e187f0551af03a1335a650da