Malicious PDF — malware analysis report

Static analysis result for SHA-256 523dfa2d3e247403…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 08:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17b08ac7ea19ce635cbdf7d3d261647 SHA-1: 72f5cd0fd193a664ad08856dfe31b3dcb9c00814 SHA-256: 523dfa2d3e247403f5f737ffe48533f45953ad4c981371e3a00d82e23d05b4aa
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm strategy. The primary malicious URL identified is 'https://kuzutuzo.ru/award?keyword=cadastral+map+pdf', which is likely used to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to drive traffic to potentially malicious or deceptive websites, possibly as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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/award?keyword=cadastral+map+pdf
    • http://jamonomikusuka.22web.org/wirigivaj.pdf
    • http://dunigaki.22web.org/broken_bells_the_high_road.pdf
    • http://jumovuv.22web.org/aua_interstitial_cystitis_guidelines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_2e78a0e6e3ee4a8994a09d74d25d6e52.pdf?index=true
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_0610dc3b7f0d4fe59b3fca7b1d9948fe.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_53470c69594245a29e0881583d34d6fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47615191-15e1-4172-b54e-ffdfdc4652a2/13591362040.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_48efc2b71bdd4244977a1776489ed08a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c28a069-6e61-48a3-9947-053b34eaa055/project_management_software_for_small_business_uk.pdf
    • http://sakikuzugodo.rf.gd/boolean_algebra_class_12.pdf
    • https://uploads.strikinglycdn.com/files/3650fd50-7a73-4a82-8de1-7ccaec2e5bc4/688923420.pdf
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_9dbef9cbde9e435aa5851cf587d4c736.pdf?index=true
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_0ce87a943a0c48608866480d4b320543.pdf?index=true
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b4e5cd76ebf14a40bd23781b483ed8ff.pdf?index=true
    • http://pulijivugis.epizy.com/bambi_full_movie_in_tamil_free.pdf
    • http://luwawabegopit.rf.gd/madupirepu.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_4211578e509041309830fa0e54afc4b0.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_53eccfd81bc444a9b094094d390855d7.pdf?index=true
    • https://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_9a906a3669414000b3f3a51bb1fcd504.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_19a9aa8d7da54daa8206c9ffbac64314.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_34584991aa5947548bd9b20aa20cea04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a61a6848-6623-462f-a883-839870961236/53675377603.pdf
    • http://demuremapinob.epizy.com/allied_telesis_at_8000s.pdf
    • https://uploads.strikinglycdn.com/files/609f1142-416c-4cbf-88a4-321be1b76cf0/milavoxezifoxudutifojije.pdf
    • http://watokugen.epizy.com/chinese_zodiac_years_chart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c4.bin
e4c65bc974f2494d9a254b131344b03117548fabb74e0d6ec5caaa6a0fb981ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 5092 bytes
font_01_sfnt_off00011af7.bin
8638b0805b9105d52ac75a4a510cd0dfe871a04a148ae2304e5f302b89eaa22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 12144 bytes

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