Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed3b3bd746a4c1c…

MALICIOUS

PDF

75.1 KB Created: 2021-01-22 17:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2553aec068429467b1b14822c7923381 SHA-1: 8e090efa385441b95dc07e7806d9057448ffe40a SHA-256: 4ed3b3bd746a4c1cceacd2553ad1b4a8402b7bac14fb4ae1fd40409ececd7d95
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=earth+song+lyrics+michael+jackson PDF link annotation
    • http://vuzosemeve.22web.org/aagadu_bluray_video_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/Ifryhj4/baby_shark_vr_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/Rjbhjhg/nosujugotebuwafol.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/dTibthj/top_up_my_btc.pdfIn PDF document text
    • http://jokidinavefo.22web.org/butterfly_life_cycle_worksheet_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/napefabet/ffieiea/sumelerebu.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/gjibjgL/kiki_animal_crossing_favorite_color.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5ff7b8606c32c.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/giYljey/gemukebevepaxiwevuw.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/android_adb_driver_windows_10_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozaxanakix.epizy.com/arcana_mod_apk_1._68.pdfIn PDF document text
    • http://gizimup.epizy.com/chanti_movie_songs_please.pdfIn PDF document text
    • http://jomedive.epizy.com/91777852724.pdfIn PDF document text
    • http://duvexarido.epizy.com/outwood_bydales_uniform.pdfIn PDF document text
    • http://metukobitoro.rf.gd/kindle_fire_movie_file_format.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5412 bytes
SHA-256: 2c3f27305201398bbebc3b70705888a46ec9403674c2cc6bc2309397210d370f
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10888 bytes
SHA-256: 81e74eae046386f8b3ffe6d36cd7dd2e655cb3b2c589b98f3745d118d0a0252a

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