Malicious PDF — malware analysis report

Static analysis result for SHA-256 931c71ea106afe0d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 06:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 25b7b5fdfcb472ce6dacac62a8f53f12 SHA-1: d12baa875245e315f2f39582c3b768be1f1b93d4 SHA-256: 931c71ea106afe0d01cd8391f31150aaee65332e82ddda1a4f056e266bfdc4f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites.

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
  • 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://resalured.ru/aws?utm_term=how+much+do+nurses+earn+in+india PDF link annotation
    • https://cdn.sqhk.co/simikitivo/fgfjidS/lep_s_world_2_online_spelen.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/nupojiwelopixixizurasockq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216b8aa8a73.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/Wq4Lja1/fijajudiseretejazon.pdfIn PDF document text
    • https://cdn.sqhk.co/sigagegijej/lOhadid/play_store_app_install_download_free_fire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5ff4c5627e1b0.pdfIn PDF document text
    • http://igcopyrightforhelps.com/bukegaja0ch9e.pdfIn PDF document text
    • http://lestyprin.online/590225156978im80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60146cc4d3dcb.pdfIn PDF document text
    • http://livecopyrightverification.com/wujixuxemie7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fe286488360d.pdfIn PDF document text
    • http://itdiscounts.info/autumn_leaves_lead_sheet_cmip29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_600c08e6816f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fdb2bcf52353.pdfIn PDF document text
    • http://teplotronic.ru/what_is_meant_by_module_in_educationflkq4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_5fe9b68f85a79.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
    • https://uploads.strikinglycdn.com/files/e3435e8b-acf6-4344-ae14-dfdf153ce14b/does_samsung_a50_support_wireless_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888c6e22-7600-46c0-95ca-20433b48c1d3/evenflo_pivot_xpand_stroller_rider_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e12152c-b1e0-4f0e-b503-6e8f3f300b53/bobbi_brown_makeup_case_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5004 bytes
SHA-256: 9effb77b2445da0d0ff8dda74a5ccd77681069d38c0badcfd15f55f00ea0d05f
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10884 bytes
SHA-256: c81eb96f2477d53955df9ac45c323c699c22a6def59761893ca8220c61b607e6
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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