Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb3a28cecff2dc8…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 15:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbcb40780380ec74fd7750b853f1699 SHA-1: d8c9ebd7c0568b9e410e58f1733393409d2bd487 SHA-256: fdb3a28cecff2dc8e45d882c1f6c6855eea68f268f0b7445adc23e6dc82adb28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=swann+security+camera+system+default+password', suggests a lure related to security camera system passwords, likely to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=swann+security+camera+system+default+password
    • http://mebel-albero.ru/sijituvadubizunuve56s9k.pdf
    • http://lnstagram-help-businesss.com/14425035414v7ko.pdf
    • https://cdn.sqhk.co/vikaxokaso/VhbjaM7/in_car_racing_game_download.pdf
    • https://cdn.sqhk.co/nixibaraje/ihjgdjZ/free_hd_movies_cinemax_hd_2020_apk.pdf
    • https://cdn.sqhk.co/tozegatopaxu/Phb7gji/kusorawu.pdf
    • http://myfoxing.online/dyson_v6_motorhead_rear_filter_removalub338.pdf
    • http://copyright-services-us.com/the_new_gate_anime_stream2dpxg.pdf
    • https://cdn.sqhk.co/vikojovowoso/fZuhjiO/47801797324.pdf
    • https://cdn.sqhk.co/gukisafuw/T1nhfl6/bird_box_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_c0b4d3e622e345219a5c547c306fd6bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a57c7ea1-b97b-43cd-a3d0-b538b0c19956/when_the_sun_comes_up_in_the_morning_hymn.pdf
    • https://uploads.strikinglycdn.com/files/264dfac7-02bb-478b-bf24-682153f349e7/foteromevimepubegede.pdf
    • https://uploads.strikinglycdn.com/files/0458856e-8d1b-477e-a8f1-5e08d221f0a7/black_and_decker_planer_7696_type_1_manual.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_bb8dde9c143d4fde9fd762b73defa748.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1159b9d-1f92-4d58-93fa-58c7156c67d5/zumaze.pdf
    • https://uploads.strikinglycdn.com/files/704d369b-c88e-4999-94b6-c32de243a6bb/first_alert_radon_test_results.pdf
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_126e2ba8026f4a08a2f7cb6aac00e2fa.pdf?index=true
    • 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_off0000ef53.bin
636d6ceedbe546c4149a135edd952f86c8881e364f68063a6a0817c3ed8cf7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 5596 bytes
font_01_sfnt_off00010262.bin
72baf2fc19b475991cf66f9e3a10f53073b6dc742b5d4f02eeda371ebc480071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10964 bytes

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