Malicious PDF — malware analysis report

Static analysis result for SHA-256 db921666a70e8ad8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-19 05:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ef4875634c8bcd9cc0762c51611f972 SHA-1: 904f6b0bd62e702c8af6bdad4029ab7ef3ae2d3e SHA-256: db921666a70e8ad84a53396849a139528405aec37a724451935a236a9137e82a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=manual+metal+arc+welding+advantages+disadvantages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489601/normal_6049ecac425a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fe62d9055a7e.pdfIn PDF document text
    • http://bigwin-1xbet.fun/checkbox_in_excel_template6c80s.pdfIn PDF document text
    • http://mavosidofawuge.22web.org/cybersecurity_for_dummies_download.pdfIn PDF document text
    • http://betmoy56.com/how_to_just_use_spin_cycle_on_lg_washertdgqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_604f440a3a45f.pdfIn PDF document text
    • http://ses-paypal.com/rejirinutusimumineq6z6b.pdfIn PDF document text
    • http://zukuwoluzut.iblogger.org/bonhoeffer_the_cost_of_discipleship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fc942a11818c.pdfIn PDF document text
    • http://opensoda.pro/html_and_css_design_and_build_websites_book_downloadc7mt6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5ff29dd26ad31.pdfIn PDF document text
    • http://idealica-uficiale.website/jeopardy_powerpoint_themebboh2.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/828612953805mui5.pdfIn PDF document text
    • http://liketime.fun/led_zeppelin_dazed_and_confused_tabp6mbm.pdfIn PDF document text
    • http://dvestideyli.xyz/lijirajiwotzwkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_600a1fce4d5ce.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/a7045cfa-5b2b-408f-8fc7-ecbaf0c2c336/leon_uris_exodus_film_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0eaa073-d190-43b5-9ec4-e332e9eb1ca6/motivational_interviewing_online_training_free_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9153a4-51c1-4481-9023-e26bbe793c2e/beautiful_creatures_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606d6d3e-c844-4b90-afc5-00ac2e941f01/94228369086.pdfIn PDF document text
    • http://befakugidutoj.rf.gd/the_aviator_full_movie_hd_popcorn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d209109-2543-4d29-993e-80e95968243e/42138820358.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5188 bytes
SHA-256: e36ebdfdc5ef97632c987a4c73c869b7883536702cd53c238f8d7cf5ff62cc4c
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10644 bytes
SHA-256: b38476c91ab4adf0900ddebcef3137ddef38c51f8635670b489e68c61a1e52ec
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361