Malicious PDF — malware analysis report

Static analysis result for SHA-256 535098b5ce91f50d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-15 02:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f35444c9bc5c280278b85fa0a4b6ead SHA-1: 7becc1d42221596453bc412ac4464fc208e53a81 SHA-256: 535098b5ce91f50dc9874e69e221f2a07b743f9e821c84e3ae66a4f8463eab25
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to educational worksheets, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=algebraic+expressions+worksheets+6th+grade PDF link annotation
    • http://xuzerujagojagip.scienceontheweb.net/do_you_use_shaving_cream_with_a_safety_razor.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/hybridization_questions_and_answers.pdfIn PDF document text
    • http://tuwuradozanava.iblogger.org/blood_type_food_list.pdfIn PDF document text
    • http://ruvetimoroneb.iblogger.org/nolisid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fe509b5961c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5ff57df063e5a.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/janekofo.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/starbucks_almond_milk_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6064a1e92f4d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidev.rf.gd/dbms_utility._format_error_backtrace_oracle_9i.pdfIn PDF document text
    • http://pugijomo.epizy.com/veresodorib.pdfIn PDF document text
    • http://ruxopagotar.epizy.com/27254242059.pdfIn PDF document text
    • http://tuxizowivu.rf.gd/34217487608.pdfIn PDF document text
    • http://povumuvepu.epizy.com/roxutadenaketepodasoxil.pdfIn PDF document text
    • http://ziboporo.epizy.com/9962666345.pdfIn PDF document text
    • http://tofezaniv.rf.gd/artist_management_contract_template.pdfIn PDF document text
    • http://zaposawo.epizy.com/introduction_to_public_policy_and_administration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca18439-2585-426c-b3b4-723ae5e7e4b3/nail_shops_open_in_new_orleans_east.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c5170c-e306-4d51-9539-82e9fe8d6b67/3003184432.pdfIn PDF document text
    • http://furoros.epizy.com/9395280247.pdfIn PDF document text
    • http://fukapoworetux.rf.gd/dokajejitelavaxumel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce30436-dde9-4d38-b2cb-517aab307baa/ics_400_student_manual.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5844 bytes
SHA-256: b848fffb8fdaa16cee13324a85924aed3d9fb4dd28ed8d715bd0aaad104da1cd
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10932 bytes
SHA-256: ef253381d6f67060aa9def104ba8ef6a260996a52945e87af3d9172926618f66

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