Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59db45414eb6e1a…

MALICIOUS

PDF

109.8 KB Created: 2021-03-18 08:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ed9f1c43febd7f93e691fd7ad09f819 SHA-1: 7f318fad3947d589b90e4110f08748efc1cdfe55 SHA-256: a59db45414eb6e1a5c7339f932c3fa3f8dd958d29a93674e4027394935de4054
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. No scripts were extracted, but the PDF structure and URL distribution suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://vilenefex.ru/strik?utm_term=what+is+a+synonym+for+the+greenhouse+effect PDF link annotation
    • http://bemijaragilez.22web.org/my_hero_foo_fighters_piano_sheet_music.pdfIn PDF document text
    • http://digitalmedialit.com/matlab_for_dummies_bookudxra.pdfIn PDF document text
    • http://rubka.space/anime_cloud_apkamvw5.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/gujefusuxivexaf6odg.pdfIn PDF document text
    • https://cdn.sqhk.co/wudenedu/e5hbhgt/wumofetuwikidinerime.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/d8hfCje/22886879371.pdfIn PDF document text
    • http://vsspb.ru/fepufuxirovududobo0awto.pdfIn PDF document text
    • http://senteber.site/36496921421csk7u.pdfIn PDF document text
    • http://volosaty100.xyz/what_was_the_significance_of_mapp_v_ohio8v1zr.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/gjh8jiG/microsoft_solitaire_games_free_online.pdfIn PDF document text
    • http://bigakeka.iblogger.org/kipaxojujiwewojexu.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/eojjFhd/nejuge.pdfIn PDF document text
    • http://50offshop.pro/becker_s_muscular_dystrophy_treatment_guidelines1mm9z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://nasalimutele.rf.gd/probability_and_queueing_theory_balaji_book_free_download.pdfIn PDF document text
    • http://tawatibajat.rf.gd/42847331353.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/the_secret_river_thornhill_quotes.pdfIn PDF document text
    • http://tokozod.myartsonline.com/jemepirizabagose.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/lignocellulosic_biomass.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/69173716336.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001796c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1796C 19040 bytes
SHA-256: c34c8ff47a1c4b4a873b7c874db5d05a7a39f23ad84a44d45117270b392fe282
font_00_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 5684 bytes
SHA-256: 721cc2fdd3dc595dcb3ceb283710897e6e3f946895107a6db3eba0a731c1121f
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 5376 bytes
SHA-256: 3479549eab25aefd9e68ecc5415c339bc7246f17c9485c905a6ab7814dc9472d
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 2656 bytes
SHA-256: ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c
font_03_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_04_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 2108 bytes
SHA-256: 5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52
font_05_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 6640 bytes
SHA-256: 593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6
font_06_sfnt_off00014890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 16032 bytes
SHA-256: 66f28b7dd9fa30db58e5d77cacddac59276f51a5d356e3af352063241aca41ff
font_08_sfnt_off00019837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19837 3276 bytes
SHA-256: 36e71c95d3b6602ce175a98ac99a2c18c99235fab0e24c6c46ec4ff9e72f8c94

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