Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a76cce4b60436e6…

MALICIOUS

PDF

82.2 KB Created: 2021-02-23 14:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 049437bfd4cb90cd8a2b523aeab99be2 SHA-1: 1b179e4b175dae6630dc5541d7b94535e2448cc3 SHA-256: 3a76cce4b60436e69ad5c22173752a3cf9a425641842b4265b11fe503154f9ee
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', indicating a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=get+the+message+worksheet+answers+197 PDF link annotation
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/eb6a81.pdfIn PDF document text
    • http://nadahul.ru/how_the_rich_avoid_tax_ukv9it4.pdfIn PDF document text
    • http://pristav.pro/rhino_6_subd_command_list7wu6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_601efbe344ee4.pdfIn PDF document text
    • http://bigowet.xyz/as_a_police_officer_what_is_the_importance_of_report_writingcfxug.pdfIn PDF document text
    • http://hustlinmoney.com/abirami_anthathi_with_meaning_in_tamilbdei2.pdfIn PDF document text
    • http://kovokowem.iblogger.org/too_or_enough_worksheets.pdfIn PDF document text
    • http://bilapak.66ghz.com/mugadevij.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/c2856.pdfIn PDF document text
    • http://magicwoolshop.com/small_baby_smile_imagesc0pq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478669/normal_5feb604f771e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duzudolaboxu.rf.gd/lafone.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/legujalolavavamizoxawos.pdfIn PDF document text
    • http://gedamodeges.epizy.com/java_tutorial_free_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/film_dreadout_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/78041634445.pdfIn PDF document text
    • http://fonajuwowo.epizy.com/acoustic_research_wireless_outdoor_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/high_performance_liquid_chromatography_analysis_drug.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 5540 bytes
SHA-256: 14eda69e98ab41a1e3ab1139e7a86003205a59f47de172ad9302e804b9abc894
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16136 bytes
SHA-256: 4e16170f22eca8ea6c074a85bb6c7f8fc7ed48236f4eac1fa3e6e4884def5bf5
font_02_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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