Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf7041030f8e34f…

MALICIOUS

PDF

75.2 KB Created: 2021-05-11 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c878528c57de3c9427e1f167b7b30bc8 SHA-1: cea27051491a2b6a4130d207f573067eaea8148c SHA-256: eaf7041030f8e34f659934129ef220c49fdfc43a1495f7062029cce1981da7ba
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 detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to 'maypoin.ru', which is likely used to deliver a malicious payload or redirect users to a phishing site. The document body, though heavily obfuscated, contains keywords related to a 'French vocabulary app' and 'iphone', suggesting a social engineering lure.

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://maypoin.ru/strik?utm_term=french+vocabulary+app+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fffdb7dd7fef.pdfIn PDF document text
    • http://xopijodujakik.22web.org/33871878500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_603f7d246e831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5ffe25f159f4c.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/kindle_file_format_to.pdfIn PDF document text
    • http://wigevopane.iblogger.org/chicago_manual_of_style_17th_edition_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_60473657194c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5ed9d1-c674-4251-87f9-1fcb01ff567f/watts_premier_5-stage_ro_replacement_filter_pack.pdfIn PDF document text
    • http://tefonatodidepo.epizy.com/674856222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27608505-42ae-4ba6-b176-c7bda529addf/rowaxujenategaxefumikimo.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/bohemian_rhapsody_guitar_solo.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/cds_2_ota_syllabus_2019.pdfIn PDF document text
    • http://xizujibonow.epizy.com/41475558355.pdfIn PDF document text
    • http://vagawujososoje.epizy.com/senuga.pdfIn PDF document text
    • http://lolekubem.epizy.com/la_celestina_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bda509f-3bf2-4790-93cd-980c3ce60be4/teribakexuviv.pdfIn PDF document text
    • http://ximitexus.epizy.com/astronomy_apps_for_android_phones.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5100 bytes
SHA-256: 368462fc74037fa1ce6b3765d1377223af95a665401749f2a76b676f4a7f8f01
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 11408 bytes
SHA-256: d1a20093471f4f5782aa5cf83347ccaa4ccbed76e37862186039afb96cba9e27

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