Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1d9a5caf16c05…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 04:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bac90e48b77af2c95c62ccda3eeee52e SHA-1: e2c48e37ca230361ea64bb6c7435cd681fa37baa SHA-256: 7af1d9a5caf16c054de9492a06d8c4933d7ff05596bc9222c42f3450a8a66eec
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 SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=black+and+decker+cordless+drill+18v+review PDF link annotation
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/7ab672ba5671df9.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/giaEidz/51317932431.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/language_practice_for_advanced_4th_edition_student_s_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gurukemopuge/ImigzLb/gigokaled.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/4c900f.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/estrategia_y_negocios.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/6DKFggo/biz_builder_delux_sp_apk_mod.pdfIn PDF document text
    • http://rupukimonedekij.22web.org/endogenous_and_exogenous_variables_in_economics.pdfIn PDF document text
    • http://zajegipu.22web.org/kutujumajuxatowuked.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/ALge6gf/dadoxorupepoxivadimidobe.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/JeRVNgi/arabian_drift.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/biiphhj/widenedepovamuti.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/Lgj0jfO/kaxilufe.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/tidomerufoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebugobebakejef.rf.gd/godin_a6_price.pdfIn PDF document text
    • http://pakifisaxere.epizy.com/primary_spelling_inventory_example.pdfIn PDF document text
    • http://riperuzitino.rf.gd/ielts_2_reading_test_3_answers.pdfIn PDF document text
    • http://jilejulo.epizy.com/kapawibikofawalopaxamufex.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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5444 bytes
SHA-256: 0d80de49f7c104fc09b6eceb6e468d40d77fd5f9f325a1f041c2005529c31f69
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 11828 bytes
SHA-256: dd4f199ff969c7c6fc5f53f8a7ad9de7197f7b12d8ce09f46f2bd9a72280d287

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