Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfcd8df12d92683…

MALICIOUS

PDF

76.4 KB Created: 2021-01-19 12:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fd29e790fa5fc0a752e49450a6b58db0 SHA-1: f5f419d258110f8a7aa47459867fa374f5f78ad2 SHA-256: 3cfcd8df12d92683470534cea75afd1ebae03aac4915e2c724f7902d7ec76262
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 it is likely a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains references to '5th grade persuasive essay examples' and includes numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. The primary attack pattern involves directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=5th+grade+persuasive+essay+examples PDF link annotation
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/zixigijavule.pdfIn PDF document text
    • https://site-1218990.mozfiles.com/files/1218990/waxexuwofavidojumagegunu.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/junuxaripolisi-tebulut-mekazimiwogewi.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/cgfgeZp/weather_forecast_today_in_my_location_hourly.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/birebi.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/xjggfty/17685916124.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/idh8Bgf/noremowuxigebomu.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/fafez.pdfIn PDF document text
    • https://site-1176708.mozfiles.com/files/1176708/2387863429.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/3191119.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/gdRgjjh/draughtsman_s_contract_soundtrack.pdfIn PDF document text
    • https://site-1193467.mozfiles.com/files/1193467/unicorn_birthday_photoshoot_ideas.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/vamivonodoxi.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/xisakazelelinim/organic_bamboo_lyocell_sheets_uk.pdfIn PDF document text
    • http://xejarejunap.rf.gd/emerald_green_arborvitae_care_guide.pdfIn PDF document text
    • http://dojagosixotebut.rf.gd/guide_du_routard_prague_2019.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/34467667121.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/adobe_photoshop_elements_11_plugins_free.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5632 bytes
SHA-256: 3ca98d6dd7f82d480e5825841033c3770613a668c62a7428f5d5238d52121921
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 10740 bytes
SHA-256: 4e07eee4c5eaf1869e2adeafdbf86f9fd1753507ab60296d61746d8ac0ce4cb4

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