Malicious PDF — malware analysis report

Static analysis result for SHA-256 630cef0aaec0bda0…

MALICIOUS

PDF

83.2 KB Created: 2021-05-30 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3e66d67f0d361ab98b48330f7da06b5 SHA-1: d9e1b4fd78bf32509ba788ef857709c9f5f5c69e SHA-256: 630cef0aaec0bda06bc42fcfb6b43c92a360d15c4c7dfb1db6c05d9f4646af7e
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 0.9990

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://ponafet.ru/strik?utm_term=how+to+descale+my+keurig+duo+with+vinegar PDF link annotation
    • https://bogidiwimo.weebly.com/uploads/1/3/4/7/134717669/dadokokiwegefagu.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/jenidawo.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/36e6f53fbed92.pdfIn PDF document text
    • https://guwiretaxuzaji.weebly.com/uploads/1/3/4/6/134687660/dugabesu.pdfIn PDF document text
    • https://lupupoxapupep.weebly.com/uploads/1/3/4/4/134493602/8595790.pdfIn PDF document text
    • https://gazipiserit.weebly.com/uploads/1/3/4/8/134883514/3912548.pdfIn PDF document text
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/16add0fffc2a51e.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/3413736.pdfIn PDF document text
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/4608346.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/vikenulitizeximavex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/462e0a90-b4d5-43cb-bb8a-ca338984e1b0/wukikejosegavamovulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7011a8f-e030-4e00-b63a-1b55bb4a8bdc/ghost_boy_felicity_pulman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34491faf-1482-4c95-886d-97e08b092eca/best_sat_math_subject_test_prep_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d80015-4548-4792-8582-b6aa15ca0cca/teologa_bblica_y_sistemtica_myer_pearlman_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdb7fec-87d6-48bc-b045-84897994527a/active_and_passive_voice_exercises_for_class_7_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d756e2-f77a-421f-afb5-f9ea31b3dc4b/power_wise_28115g04_control_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfeee584-772f-40f7-b43b-a41c97b41391/intermediate_algebra_for_college_students_blitzer_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0909bbd9-546b-4576-85e4-f768f9b72987/how_to_find_mass_flow_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905c4fd4-bab9-459b-b646-393aa6acf0da/best_online_fingerpicking_guitar_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6cd835-ab83-4b56-a41a-4d03b6335158/wefepelixumuxijalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf898d65-717b-44f1-b668-696f843b059f/dojigatebumovefulidomoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9490d27b-ebd9-417e-ae89-14b8a5aecb94/41871659543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a85187-e70d-4313-bef8-978bb0f3cdf3/spider_man_comic_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e99d66-aa8c-423f-90a2-70dd7ac31dd9/does_luke_have_more_midichlorians_than_anakin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5516 bytes
SHA-256: 37efc3e318edb8aacb687f2af8bea4f590488524375c4584e5edfe56426c9dd7
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10672 bytes
SHA-256: 7e1f6a9642e0b4c567fc0f809b08aac21003c8941793b89bba67683b03f06a85
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c