Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4fcefee315c607…

MALICIOUS

PDF

117.5 KB Created: 2021-04-20 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e76706321342d4ef023567555f9c338e SHA-1: dd6df17871f438c375c5f4af8abb3602205670d8 SHA-256: dc4fcefee315c6070e5c91af754b0b40b57230096d3488596113f1b0f098d794
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL, https://xezojetit.ru/strik?utm_term=writing+effective+sentences+worksheet+13, is likely the primary malicious destination. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/strik?utm_term=writing+effective+sentences+worksheet+13 PDF link annotation
    • http://rabisoluvilava.iblogger.org/zikuxisugutoxelakexojel.pdfIn PDF document text
    • https://rofewure.weebly.com/uploads/1/3/3/9/133999154/tebafomewav.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/wings_of_fire_book_11_audiobook_free.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/3169817.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/ac7099bc-9715-48fa-81f7-1a2938685d31/book_summary_rubric_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/2002_club_car_golf_cart_seat_covers.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3e7c4df79a944a0b91660652359e758a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/48799291217.pdfIn PDF document text
    • http://xusoloturokuk.epizy.com/agriculture_and_food_processing.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_68f739f26acc48dda0be7065c3d065b5.pdf?index=trueIn PDF document text
    • http://zimipasazodid.rf.gd/53388960043.pdfIn PDF document text
    • http://wijurum.epizy.com/visexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be773b5-b768-4712-b2a7-78b545753699/rogilesajosos.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_984e75659bbf4224be6b6b36c03f4de0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e7891b-3cba-41ca-ac3e-9bda73e13418/46014863805.pdfIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_4e47a54d99044bd7b6a84f1f0078b333.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_4a1f6fa49af34c8199f349a860592f69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6096efe1-8bcf-44c2-99fc-96d4ee85e4d6/what_started_the_great_depression_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0c66fa-9c2a-473b-893d-82bfb80b4f47/math_kangaroo_2015_questions_and_answers.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_off00019034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19034 5344 bytes
SHA-256: 3952cd62a01057984a5cc64afd83844bc57a358cfb1c5119fa3697ba6de67743
font_01_sfnt_off0001a297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A297 11188 bytes
SHA-256: 4ceac984739b21e6cc8e6775b1ed383891630439b64c6f1b97ba5909e0d80669

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