Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ca1f911c1d6fa3…

MALICIOUS

PDF

74.9 KB Created: 2021-02-12 22:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5b2efc99d324197280211cd652fadf89 SHA-1: cee6faa200c3f26acd0614fa7d76021c19d97aa4 SHA-256: c2ca1f911c1d6fa389b626047a8b37bd55e9c9ecd0a0e40b8b17aef30f4272eb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. The document body, though heavily obfuscated, contains keywords related to worksheets and answer keys, indicating a lure to trick users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/wix?keyword=water+cycle+worksheet+answer+key PDF link annotation
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/xumalenozofu.pdfIn PDF document text
    • http://jotepuxigavof.iblogger.org/google_sheets_budget_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/01yjagf/haki_soccer_stars.pdfIn PDF document text
    • http://noxesim.iblogger.org/nursing_dosage_calculation_practice_with_answers.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/kuruje-wukeremipumut-tuvawivusof-nozizibatafomod.pdfIn PDF document text
    • http://repovor.22web.org/ziramivujosatugofagu.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/suzugopegamar.pdfIn PDF document text
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/352d3feef06843.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/dibefolurowukanutoje.pdfIn PDF document text
    • http://lujovotoloxes.iblogger.org/sepsis_3_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokolul.epizy.com/10999122983.pdfIn PDF document text
    • http://wafitiw.epizy.com/xovepavileb.pdfIn PDF document text
    • http://gevewodex.epizy.com/dujezakutudazididetev.pdfIn PDF document text
    • http://zepedijuva.epizy.com/41387355820.pdfIn PDF document text
    • http://fufagarafe.epizy.com/69210572871.pdfIn PDF document text
    • http://bekabugi.epizy.com/ritesu.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/california_consumer_privacy_act_2020.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/roxojokiwuvuwozez.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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 5156 bytes
SHA-256: 7dded41a2a1874580c50e70365e5d4db955abc8eed5fd786ae4e4f6b497dfe47
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10564 bytes
SHA-256: 27ade47b05442823141c1a691e04a5538291685f288b30c7a25272496fbea9e0

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