Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6470d9cd0f5762…

MALICIOUS

PDF

74.1 KB Created: 2021-02-08 00:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 481f61d42a9a57d0b9aefdac976dbf85 SHA-1: 210ab581895eac08dc43475ec7d70a9f9caff02f SHA-256: 7c6470d9cd0f5762643adbec31a49d554cf90d5fa8eec622df05e4fb35feb06d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to document downloads or search results, aligning with phishing or malware distribution tactics. The presence of multiple disposable hosting domains and UTM parameters further supports a campaign aimed at user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/123?utm_term=historia+de+la+enfermedad+pdf In PDF document text
    • http://maykistore.ru/bisutaxurwmf5k.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/Usa0Xr1/speedy_cash_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ziijheV/nintendo_life_top_50_switch_games.pdfIn PDF document text
    • http://1yamal.space/unprotect_excel_sheet_software_freeuk78i.pdfIn PDF document text
    • http://businessoutsourcing.info/anna_quindlen_a_quilt_of_a_country_claimhcttc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5ff34a1b77cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_6014e655b0470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fded0f3a2796.pdfIn PDF document text
    • https://cdn.sqhk.co/losopodelim/ahgNtid/fadigoju.pdfIn PDF document text
    • http://rovepofaji.22web.org/nivivakemurowadojiwuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_600bcdc18ac5c.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/gJjhjhc/38024966650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5fefc868b2ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5ff2c0d0c4b97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatojigetafugud.epizy.com/october_2019_monthly_calendar_template_word.pdfIn PDF document text
    • http://podekorutad.rf.gd/84576526360.pdfIn PDF document text
    • http://wetusadesaxoni.rf.gd/pibuwifixa.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/54139243753.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5148 bytes
SHA-256: 5e23bb8e2d0a1726741065c6c2376cc8c760a58d4285806a0d733dc6fa8f7446
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 11140 bytes
SHA-256: 8935e86e8bb94bea491746132e46a5ee67c09e27804f6d7fe13a0118122d7e8c

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