Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef73c7e116f1b605…

MALICIOUS

PDF

64.0 KB Created: 2021-01-19 20:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 71cd62251371afeeab7cfb5cd76de4a6 SHA-1: efabdd26bfc8342ca1e160c4d4c1f096816ab729 SHA-256: ef73c7e116f1b605dcdc949bcbe8f3c6c11e34d856cf554a629923e74809c038
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious due to its use of a known malicious redirector link and impersonation of Amazon for credential phishing. The embedded link directs to 'https://gettraff.ru/123?utm_term=mcdougal+littell+geometry+textbook', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references that align with a phishing lure, likely attempting to trick users into believing they are accessing educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://gettraff.ru/123?utm_term=mcdougal+littell+geometry+textbook.
  • 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.
  • 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://gettraff.ru/123?utm_term=mcdougal+littell+geometry+textbook In PDF document text
    • https://site-1206392.mozfiles.com/files/1206392/daily_news_bettor_s_guide_week_5.pdfIn PDF document text
    • http://zixosoliga.iblogger.org/el_partido_liberal_reformista_aboga_por.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/ifyjahe/60239410608.pdfIn PDF document text
    • https://site-1175279.mozfiles.com/files/1175279/79055959.pdfIn PDF document text
    • https://site-1216840.mozfiles.com/files/1216840/mikrotik_hotspot_login_page_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/snsif55/voxaditeretinalinon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizutobasuxolom.epizy.com/dategugozegobonifad.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/polynomial_identities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/us_gambling_appellate_body_report.pdfIn PDF document text
    • http://turegipamikum.epizy.com/non_deductible_ira_contribution_irs_form.pdfIn PDF document text
    • http://difugarulid.epizy.com/vileriv.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/9111418324.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/58310264079.pdfIn PDF document text
    • http://jefelaxe.epizy.com/formal_clothing_online_australia.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_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 5460 bytes
SHA-256: ce09ce77fe01a10c923a1f77ca9d7499dc5f2a9f4872daa0a2d49175bc62b3cc
font_01_sfnt_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 10144 bytes
SHA-256: 0ad6db3c2a3117a45069af53954d468eb5de5d6f1a6cb84b6b1d9b1c429c85e7

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