Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d5cdf33a46c19c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-08 15:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0346952ab943153fd572a660f442124 SHA-1: cd913069cddae478fc3ee686e18dc8177a1d2ccd SHA-256: 28d5cdf33a46c19c76e107c15d64c7bf18e89677f2819fe0505fed01346c5efe
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=schumacher+sl1315+jump+starter+manual PDF link annotation
    • https://cdn.sqhk.co/kogujipubap/hdjaI4R/fekidefuwefu.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/ic2dig9/kamevojabosaxawun.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/30702927922.pdfIn PDF document text
    • http://sputnews.com/workcentre_7845i_toner_waste_containerk9xja.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/eifwFHU/admanager_plus_console.pdfIn PDF document text
    • http://rent-nout.site/52279677059rdlgh.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/z5Yijhh/fritz_kreisler_sheet_music.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/41735233977.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/google_earth_maps_download.pdfIn PDF document text
    • http://tolofat.22web.org/nalekivozomasoxogewal.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/what_is_a_good_sat_subject_test_score_for_math_2.pdfIn PDF document text
    • https://cdn.sqhk.co/bonipumijed/DhaghjU/balawatanumefegemimidanev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakawarinuku.epizy.com/abcd_songs_naa.pdfIn PDF document text
    • http://rufolexuvolup.epizy.com/game_despicable_me_2_mod_apk.pdfIn PDF document text
    • http://modunatotuw.epizy.com/percentage_increase_decrease_word_problems_worksheet.pdfIn PDF document text
    • http://xunevonobi.epizy.com/14383674375.pdfIn PDF document text
    • http://xefubadopevabe.epizy.com/lozagemo.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/rabalajinijutikeforo.pdfIn PDF document text
    • http://tijejawoporufil.epizy.com/signs_of_acne_on_forehead.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/xekumakekuxuzopevupikuni.pdfIn PDF document text
    • http://nosofakonitul.epizy.com/2414509485.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_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 5692 bytes
SHA-256: 9303ebfc8062a67eb5d844b8143914f45d39d69cc4e6b442fdd347f225da9f4b
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10928 bytes
SHA-256: cca4c3fe123011682e2912b7aef3a3340f1bdb738ee2e72510e12b95cbcadfc0

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