Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3e1a652babdd02…

MALICIOUS

PDF

125.7 KB Created: 2021-03-01 04:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a6a6ff75bc7ea76ce07d5b02bd781cb5 SHA-1: 1ea5a2d26977a80459aa536ba5aeecc12f86f54a SHA-256: 1a3e1a652babdd02922a24a77431270a51cbeba381e130c7f4f4101a9c4e27c5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious content.

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://jottigo.ru/award?keyword=what+is+the+third+industrial+revolution+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fef7beaa0467.pdfIn PDF document text
    • http://sarepoxorak.22web.org/manual_do_meghmetro_megabras_mi_5500e.pdfIn PDF document text
    • https://legufita.weebly.com/uploads/1/3/4/8/134866723/damugubovubatijorid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_6013a1d8b71c7.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/6659039.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/f5d95f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_602403796741c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/vigenafivager.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/type_of_parliamentary_form_of_government.pdfIn PDF document text
    • http://gewekerob.epizy.com/consumer_reports_convertible_car_seats_ratings.pdfIn PDF document text
    • http://fujexadegog.rf.gd/does_straight_talk_have_unlimited_mobile_hotspot.pdfIn PDF document text
    • http://dirujuwut.epizy.com/introduction_to_information_systems_7th_edition.pdfIn PDF document text
    • http://mibavened.rf.gd/11360494129.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/tomaduvikukowu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/free_duckduckgo_browser_for_pc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A40 5068 bytes
SHA-256: 01c2803fd9d3b7b516fc6f6a527a1ce415b3a1ba2b165d7fa74a012647bb3f17
font_01_sfnt_off0001ab88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB88 11784 bytes
SHA-256: fb3547c9ff267030292687152f88457a8f34d5e96f424468fc8aa358ee3fa72b
font_02_sfnt_off0001d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3DC 16144 bytes
SHA-256: f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86

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