Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6abfa94fdcef37…

MALICIOUS

PDF

74.4 KB Created: 2021-02-09 22:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 369091fd7262940668f26c6bb579ca6c SHA-1: ab684b073c4a469bc3e9bf249118015c1becd70b SHA-256: 4c6abfa94fdcef37377d959f4e550ce9a0faad003b160c7e5b35a129eda3d47d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains numerous embedded URLs, with one prominent URL pointing to 'crophysi.ru' and another to 'cdn.sqhk.co', suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains references to 'Melbourne to adelaide road trip guide' and 'wkhtmltopdf', indicating a lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/aws?utm_term=melbourne+to+adelaide+road+trip+guide PDF link annotation
    • https://cdn.sqhk.co/kifuzopeko/6hfdnhc/frontline_grand_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/hvjdQjc/stick_cricket_2_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/dcgdgg6/setiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fcedc8d32872.pdfIn PDF document text
    • http://life-news.tech/ejercicios_pronombres_posesivos_inglv4sn5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_60011f8e9e3e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/gesRrAM/best_rock_songs_of_the_2000s_playlist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fdae21f3765e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/JbeRhbT/54910122020.pdfIn PDF document text
    • http://jowopejev.22web.org/cad_2013_full_crack_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/HgftAif/zapagivelig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc5ec82a0cf3.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/xixonu/65032445326.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/bexenevesenomojar.pdfIn PDF document text
    • http://zizakipu.epizy.com/60067628965.pdfIn PDF document text
    • http://mujofekiroteped.epizy.com/hd_screen_recorder_free_full_version.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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5092 bytes
SHA-256: 704002cf676e0f178dac942eee17c4175ece069b5a7f107ac283d29cc9a1e6b9
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 10884 bytes
SHA-256: c869b31726a021253b6f8b2af5d474b52ca9d05c2760efe852a093caac699043

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