Malicious PDF — malware analysis report

Static analysis result for SHA-256 3effece3da1087f7…

MALICIOUS

PDF

100.1 KB Created: 2021-02-27 19:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5f9e3008437b54d7a515a6facdf19429 SHA-1: 38d9b06ab09bcbbb9d035560e45cedaf4e31ebb9 SHA-256: 3effece3da1087f7a5959b1f77ab559628436794df5dbd72e9453606b0582c9a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The primary malicious URL identified is https://jottigo.ru/award?keyword=claim+evidence+reasoning+in+language+arts+worksheets, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=claim+evidence+reasoning+in+language+arts+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fef9720ae096.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/operating_system_not_found_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/ijnjchf/alabama_road_trip_route_planner.pdfIn PDF document text
    • http://legionmone.xyz/lovesodawidipimiw31v40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_601b3b6e58d28.pdfIn PDF document text
    • http://wonnaturila.space/whats_a_quote_sandwichwaqy9.pdfIn PDF document text
    • http://dvigatel.guru/fender_mustang_iii_v2_specsyhila.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/zxeZxid/30333492129.pdfIn PDF document text
    • http://zoom-omsk.ru/913463405819jfmw.pdfIn PDF document text
    • https://cdn.sqhk.co/pomijatan/auihjgy/wuwilixilisaramaf.pdfIn PDF document text
    • http://return-0.com/535687091fizhx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd1b59ea1e0f.pdfIn PDF document text
    • http://optamorem.com/gupugisipejj8msq.pdfIn PDF document text
    • http://erse.xyz/bomboniere_laurea_informaticaxgofg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegugoleta.onlinewebshop.net/consecutive_numbers_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/coffee_cup_calorimetry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/pediatric_pneumonia_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/catharanthus_roseus_review.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/77723094003.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/jiregusesemaxa.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_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 5472 bytes
SHA-256: 29280ed8d164f39e7e906848d9383f291d95468943c53d11a252146f3485e388
font_02_sfnt_off00015e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E97 10408 bytes
SHA-256: 68755ea2109a092ad894cd3b8f18740cb40444e572dbd7b7c2fdb8e4ebb5128a

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