Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b63a57fa196b7a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-21 03:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 731e138ad5edb631f0edad10eba02f32 SHA-1: c4d1da9ebd47649a5c81d17992221ac624e57da2 SHA-256: b0b63a57fa196b7a243b76a8a2fad9ed9b5627678e4d09f256c2494586922a80
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'zajinet.ru', which is likely a malicious domain used to host the next stage of the attack. The document body, though heavily obfuscated, appears to be a lure related to common search queries, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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/strik?utm_term=why+is+my+kitchen+faucet+leaking+at+the+base PDF link annotation
    • http://gixapedotamerow.mywebcommunity.org/whirlpool_wdt720padm1_service_manual.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/44116933700.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/63894647591.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/4283140641.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/wizidimawag/68692412423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1adeb5-0d01-413c-bb63-4cf8729223c2/how_much_is_bobbi_kristina_brown_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb071e1-876f-4944-b35d-ef95a040bb85/ar-15_m16_lower_spring_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710a0651-c986-444a-99cc-7f1b0501cff3/john_deere_l120_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df5e87-cf7c-42f1-af03-652857136d5d/nalotozakivek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0ef004-9b0e-41b2-b2f1-b3996d246a90/we_the_animals_book_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/car_theme_for_powerpoint_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55d195e-1ebd-4e2d-932e-b081e11f7fec/25000879365.pdfIn PDF document text
    • http://duziroro.myartsonline.com/85372093743.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/volume_of_triangular_prism_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/65848419149.pdfIn PDF document text
    • http://widusop.atwebpages.com/66951082059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae60ef4-da85-47d1-98f4-15be71912432/63202947385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ca3a59-fdc9-439b-87d2-fd77600e71fc/how_to_record_sales_return_in_gstr_3b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5633ecb3-0d19-4a1e-86c4-b8d0db23e69a/computer_forensics_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/reddit_best_meme_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375ac283-40f5-4fb7-aee6-959cdab014b2/how_to_defrost_samsung_rf4287hars.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/dusijerejubozageridus.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/external_style_sheet_css.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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 5516 bytes
SHA-256: 6b7a6067c737493ed5912baa05b8f04415cba78db5cc6948a2d8101b4d8709d4
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 10452 bytes
SHA-256: 6cc9c5be29f409d1546ebe0265021c214f4fed58848c136047bb4cb2c01598b0

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