Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49d31fc62799dd7…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 10:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b78ab431f000fb51d4fb16347bf9bf5f SHA-1: e9502c0a5914274af420890f81f6f03e305ee0f2 SHA-256: f49d31fc62799dd786343a94d082512076354a236e73d308cf9fe6ba69359025
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jottigo.ru', likely serving as a lure for users interested in quiz answers. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=logo+quiz+answers+level+17+and+18 PDF link annotation
    • http://fizifuzusizez.iblogger.org/wetuwilosuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_6047f0bbcb011.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/66165606347.pdfIn PDF document text
    • http://beautytopshop.site/trx_training_upper_body442oy.pdfIn PDF document text
    • http://presente-top.store/pronouns_worksheet_3rd_grade8q544.pdfIn PDF document text
    • http://verification-help.com/do_fathers_get_paternity_leave_in_ct6i143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5fc7dc3af05bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_603042548f4e4.pdfIn PDF document text
    • http://bewerab.22web.org/bokidejigajuxoduladu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_6009849ac1d5f.pdfIn PDF document text
    • http://nigma24invest.online/11450824035phlep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601fee3a4f48d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/megunalotogeketijivoxamuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbae295-6426-4241-8eaa-630e5a57f112/what_does_johnsons_reconstruction_plan_call_for.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/cub_scout_outdoor_code_and_leave_no_trace_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862b0487-192e-4e0a-9f54-10c8a2b3f3d4/97899101438.pdfIn PDF document text
    • http://nevegeb.rf.gd/how_to_fix_all_.dll_file_missing_error_in_windows_pc.pdfIn PDF document text
    • http://fifomivosa.rf.gd/37452642092.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/aristotle_categories_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/best_paper_airplane_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/poetic_form_of_dulce_et_decorum_est.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_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 5588 bytes
SHA-256: 75df79156f374a75d8d1146c2bb511f41c04f5fb5657caee847d9a7919d7ec9d
font_01_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 12108 bytes
SHA-256: ad4658a012a25049413fd9e67e12121e4f78e633bcfe2e4d4f0309d118f88fe4

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