Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8f8f0294ee0ab5…

MALICIOUS

PDF

72.5 KB Created: 2021-03-13 16:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68eda71955d2397d4044310a03337e5a SHA-1: f05b4f7c769649902ecdf55df377685cc2ebbcb6 SHA-256: 8c8f8f0294ee0ab574467d3ab0dae9af36dba67dfde605b976ccd3e6f5848071
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and UTM parameters, reinforcing the phishing or spam lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://golowaki.ru/wix?keyword=2020+school+calendar+qld PDF link annotation
    • http://texivej.sportsontheweb.net/72091541812.pdfIn PDF document text
    • http://muparizuxufuxud.22web.org/agenda_for_staff_meeting_template.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/how_to_turn_on_blendtec_blender.pdfIn PDF document text
    • http://fosaralivenowom.iblogger.org/binejebifafewonipedifa.pdfIn PDF document text
    • http://beautytopshop.site/39419363346eoq8n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fd7af2c8255f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_604512feab9d4.pdfIn PDF document text
    • http://xigotazuwal.iblogger.org/lavixasa.pdfIn PDF document text
    • http://health-top.ru/python_for_loop_break_continue_passe8i8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff9cf956181b.pdfIn PDF document text
    • http://goloszauniver.fun/56062822464qrn6e.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_are_the_parts_of_a_faucet.pdfIn PDF document text
    • http://excschool.ru/800584880829gw9p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_6023c0de98aa8.pdfIn PDF document text
    • http://perexifolelave.iblogger.org/samsung_2020_price_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rapuwovire.rf.gd/php_7_data_structures_and_algorithms.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/45347794648.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/words_that_start_with_xio.pdfIn PDF document text
    • http://webomaka.rf.gd/62423804868.pdfIn PDF document text
    • http://nexolep.rf.gd/what_are_the_objectives_of_auditors_in_auditing_data_management.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/bluebells_of_scotland_euphonium_sheet_music.pdfIn PDF document text
    • http://wuxojawe.epizy.com/23217390637.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 5332 bytes
SHA-256: d273ea25b31a61b176df076e3e9727064554a8a8392d087f1de3ff5b472c7cf4
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 10460 bytes
SHA-256: 7f269278309b5c56e4b39f46c5ecd93a79a1f119235402bdb0f54a030a358510

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