Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf306121e932ae06…

MALICIOUS

PDF

82.8 KB Created: 2021-01-28 08:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 56781b7dffe41eddcd2c2cb9308bfc46 SHA-1: 97f619fdfc2eda5a5d539e4a5b9bcf766326bad2 SHA-256: bf306121e932ae06f1ba19540455df23ff606ec2e459f4b8bf02f4e1c584afa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of embedded URIs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, but the primary malicious activity appears to be the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=kingdom+hearts+opening+piano PDF link annotation
    • http://kiwirixup.22web.org/tipojumepemex.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gcjbmiK/zonikawupeximu.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hcWt44P/kawaii_game_coloring_book_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/1bzDrhq/pixel_worlds_mod_apk_2020.pdfIn PDF document text
    • http://craftsmansmetics.com/totuzinubeizess.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/hhjjie0/zovuforarulelo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/NVjahbl/detention_melanie_martinez_lyrics_clean.pdfIn PDF document text
    • http://shtangye.xyz/neo._emu_pro_apk_1._5._37l3k13.pdfIn PDF document text
    • http://kutufirix.iblogger.org/xudagigafeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/EVe4jb7/dixuzizajinosesen.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/hgdiaGc/mutudepokuxujenimavop.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/Hgihibz/tofekogiwizufomezazab.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/jcb5fgi/orthodontist_assistant_vs_dental_hygienist.pdfIn PDF document text
    • http://detonic-ro.website/talking_tom_free_download_for_samsung_mobile8ofqt.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
    • http://todonoto.epizy.com/sun_mann_bawra_song_pagalworld.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/13864713719.pdfIn PDF document text
    • http://puwepubofixa.epizy.com/anniversary_special_song_2018.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/86738666990.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5100 bytes
SHA-256: 3e60f1cf4a074f276bf16e67d8e3678700b95787c26bef868f0506bbecf2f669
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 11940 bytes
SHA-256: d1efce4d3533650bedf005a9992b4088f260e20b41149fcdbaaac2d3baa0f568
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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