Malicious PDF — malware analysis report

Static analysis result for SHA-256 3220341025118097…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 07:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cd838b82b325e97a540f53ac00b893e4 SHA-1: d84ba08b4b459252802af47b58c6a8d04e9fb353 SHA-256: 3220341025118097364242fe1af6c1dc24f3bb041157a07e4ea3dedddc39347d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to learning English, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/123?utm_term=apprendre+anglais+facile+pour+debutant+pdf PDF link annotation
    • https://cdn.sqhk.co/gobavata/fvhbih1/hidden_horror_riddles_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fccda7c6c675.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/qjcGBcE/real_offroad_simulator_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6013b2586e1a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/dhjVcwW/mizevivug.pdfIn PDF document text
    • http://smilex.club/cedric_villani_birth_of_a_theoremw20zt.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/jYOakji/best_marketing_jobs_in_canada.pdfIn PDF document text
    • http://cadenalia.com/do_turtle_beach_headphones_work_on_xbox_and_ps468ikj.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/8hckcia/top_up_genshin_impact_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/cCLmihT/astral_chain_dark_hero_twin_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/Jniihgu/my_pillow_towels_commercial.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/0hcL8hg/19978310271.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/40heicr/evolution_2._0_book.pdfIn PDF document text
    • http://gnoogle.site/princess_bride_free_full_movie0k5r5.pdfIn PDF document text
    • http://italystore.pro/kijojanejejalwoczt.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/yhfvjj8/robert_frost_poems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_bde9e567ea7145d79b251584d1f2bcff.pdf?index=trueIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_b5d50ab24f664b68a8c52534aaa3dbf8.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5332 bytes
SHA-256: 1a42782568443716d0846e6898b4439ce801a77836de52711368e27c1f081335
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 12568 bytes
SHA-256: 42ab46e3c69b5dd46bbe5211db1931a5a7a9f2bfa48331106ec8ff76089b658b
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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