Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1622ced58b484c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-14 02:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14d79c976dc7bf8f5fb48aa69e3470ba SHA-1: 7256c0fbd3df11207459356a3fa4cad8981ca160 SHA-256: ed1622ced58b484cb6a9b220df74dec377f1e07efd84bad560480680f7a8e268
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('catamma.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=tu+mere+samne+song+download
    • https://cdn-cms.f-static.net/uploads/4461511/normal_600a3f4501f0f.pdf
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fc6cf98ac023.pdf
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff0ca568a86d.pdf
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fda22d085b73.pdf
    • https://cdn-cms.f-static.net/uploads/4444110/normal_604395ab1de29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://masaxudeve.pbworks.com/f/ouija_board_directions.pdf
    • http://gibuwodebu.pbworks.com/f/fakumufuvefafafalasuj.pdf
    • http://barumena.pbworks.com/f/david_copperfield_chapter_3_questions_and_answers.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144427710/tamilrockers_hd_hollywood_movie_download_in_tamil.pdf
    • http://ropotupi.pbworks.com/f/how_to_close_diaper_genie_lid.pdf
    • http://pilujibos.pbworks.com/f/zuvejoti.pdf
    • http://wotasaful.pbworks.com/w/file/fetch/145269888/omah_lay_my_heart_beat_for_you.pdf
    • http://gudotoxej.pbworks.com/f/boboiboy_the_movie_2_full_movie_online_hd.pdf
    • http://pebokuvog.pbworks.com/w/file/fetch/144578391/chetan_bhagat_book_in_hindi_download.pdf
    • http://zekodunu.pbworks.com/w/file/fetch/145168023/wordscapes_daily_jan_26.pdf
    • http://jabodawo.pbworks.com/f/mathematics_textbook_for_class_8_solutions.pdf
    • http://wisarazed.pbworks.com/w/file/fetch/145229094/dapavorerof.pdf
    • http://zezimin.pbworks.com/f/farimazaxunakefoju.pdf
    • http://gegoxelaw.pbworks.com/w/file/fetch/144613977/how_to_put_amana_washer_in_diagnostic_mode.pdf
    • http://rabopadob.pbworks.com/w/file/fetch/144584376/libro_la_peste_albert_camus_gratis.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_off0000e4c1.bin
6ea260fd4e46ff8936e566f616b37fa8cc1e3249400fc2e7f4bba570249cadd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 5188 bytes
font_01_sfnt_off0000f65a.bin
92a59b4c700adf1692bc4550a81c59a3c860b4dbb29871c571c9e627ab048ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 10992 bytes

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