Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2145beab07d11a…

MALICIOUS

PDF

82.4 KB Created: 2021-04-02 02:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 18f1d84ed972c0e0267bb4577728200c SHA-1: 7453066b30ee133b9e3ef189713ccc12cfc53ccb SHA-256: 3c2145beab07d11a6d9dd7f8e3ded2f112b76fada2edcb2ed7e27ac895d36ecd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host links. The primary attack pattern involves redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=pathfinder+kingmaker+custom+portraits+pack PDF link annotation
    • http://melowew.scienceontheweb.net/79342362555.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/microsoft_word_free_download_for_windows_10_pro_64_bit.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/buzaduxadisetuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60555e8c89fb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_601fcf969ef5f.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/88197b6e-5671-4331-abbd-0138718a4276/what_is_the_best_app_to_learn_chinese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f248810-1ec3-4491-bf51-01862661a830/netgear_wnr2000_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5611236-1eb7-4d61-be91-ffcf647c4a96/tfs_2015_system_requirements.pdfIn PDF document text
    • http://jokugagarin.rf.gd/lexus_es300_headlight_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a49c86-b1e1-4dbe-9bfa-bc2cb52cb8c6/fudavagovebusozatimer.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/bba_full_form_tamil.pdfIn PDF document text
    • http://piserujirabubam.epizy.com/guia_aprender_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7b153b-c3be-43e5-9354-30a220a8f40b/63138409416.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/zidaxegirawuwinisaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edfc696-9455-4e04-a4a9-2491ad84a3a0/nidimolanedopoweredaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef636cba-a38c-4060-a6df-366afd17df8a/financial_ratio_analysis_project.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/52380127228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16039dd-0955-4b65-bfe1-258f063cf3c7/best_logo_design_contest_website.pdfIn PDF document text
    • http://tavawefojob.epizy.com/dobojivup.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/36039559281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6127a3de-3910-44b9-8809-c60840aecc11/keurig_k_cup_mini_sale.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_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 5600 bytes
SHA-256: 5966e9baa9c8a7cda6c4552e105c2ed20ef0f2642bd09467133d2d740f0dadc5
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 11760 bytes
SHA-256: 36f9f793530a33b06cf51f20c71799b5d8cc5436eae90813f9333f8dda4a3dd5

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