Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8e672f37f7e59d…

MALICIOUS

PDF

67.3 KB Created: 2021-04-02 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 44eed9d38a0e6115ccdc5884b6e49ead SHA-1: b191b337ddfa5042ce597841b54daff2ae9b0887 SHA-256: 6e8e672f37f7e59d4bafbffbb0d1fff82f2b32d65d165f3220ef98d3ef5bc428
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to potentially malicious domains like jottigo.ru and rm-swis-mine.com. The document body, though heavily obfuscated, contains strings that appear to be part of a lure, and the presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=look+what+i+spy+with+my+little+eye+block+watch PDF link annotation
    • http://rm-swis-mine.com/keurig_mini_k15_instructions0r3ik.pdfIn PDF document text
    • http://item-get.top/how_to_reset_motorola_g7_without_passwords3vwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_601128a24b34e.pdfIn PDF document text
    • http://genoray.pro/zusetisaropalc7csn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_60359c6d5d665.pdfIn PDF document text
    • http://cabinetsly.xyz/85433159256v4ggc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadobirak/92958933532.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_0830647c270d4cae9c343d01a5b6a5c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/f_sharp_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0638cf50-1127-45bb-9539-efa4170526a6/53486286757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbeee60-b619-41ea-9b29-f7f4c57e1fb6/finalenagomovuvixip.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_73c8eb8d86fe4075942bc71de525849f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/868db600-57e5-4c45-b522-65489a87147a/what_is_are_the_learning_benefits_of_a_case_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/is_there_a_n_y_in_the_korean_alphabet.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_79d9cba69b7a4acf85c7b36f4175fe30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddf6dc6-a18b-4c52-92b3-0182aa94da32/black_and_decker_handy_steamer_plus_food_steamer_and_rice_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/77181997331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d970ce0-1067-41cd-8a64-dd5fda39a150/wavibokifadedajuxobifisap.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_719c224dd33b4e6f87fd713ba9fc5a42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f834ebe7-ed49-4cb2-a0ba-594117a0db7e/physicians_desk_reference_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c418b3de-87dd-40f2-aa0f-a6c69f8874e8/mw_m2_to_w_m2.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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 5416 bytes
SHA-256: 71ef132a1dfb62126e21d691426158fa13c364ca30e09c14f75468a5b07bb117
font_01_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10096 bytes
SHA-256: 46e324d03535530fddcbb01dabee05b9cc487708040bcbac83f2a8fcecb08c41

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