Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b835d82cd9bd343…

MALICIOUS

PDF

88.7 KB Created: 2021-04-05 08:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b5a7dc040c9a7fa7e57072f6ae1acaa2 SHA-1: ed2a96c085f2a9192ba06ffff4b2bfedbd1bcf30 SHA-256: 6b835d82cd9bd34309fee7205a423c31b05d46d3c75fa1a8094d1f7830486371
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a malicious browser extension or update. Several external URLs were extracted, suggesting a potential download or redirection mechanism, and the document body contains obfuscated text and references to wkhtmltopdf, indicating it was likely generated programmatically to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/award?keyword=affirming+diversity+chapter+2+pdf PDF link annotation
    • http://puxelamonikur.22web.org/10_day_cleanse_smoothie_recipes.pdfIn PDF document text
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/e2bc9a7779.pdfIn PDF document text
    • https://vekosafadowob.weebly.com/uploads/1/3/4/8/134868088/bdbd947d0e6fb.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/83842169555.pdfIn PDF document text
    • https://lofitira.weebly.com/uploads/1/3/4/3/134350427/274f875b4f7d.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/grade_10_maths_functions_and_graphs.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/44954293840.pdfIn PDF document text
    • http://suvipigodu.iblogger.org/81041822736.pdfIn PDF document text
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/d50141b8e.pdfIn PDF document text
    • http://xagelofitu.22web.org/absceso_submandibular_tratamiento.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/xitusomunutomojafobamig.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/ejercicios_caida_libre_resueltos.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/7327231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f88fb8d1-f5de-49cf-82a6-f2dc53496a92/the_coldest_city_graphic_novel.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/gaxilegawesuloximedu.pdfIn PDF document text
    • http://fokidewuvawop.epizy.com/circuit_breaker_notes.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/xomeleledo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2ee4ee-1d25-48ca-948a-49366623d6e0/40774469596.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/zeefo_crystal_chandelier_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bba5842-7851-4208-b156-add452d20d7d/bafagobodupozusumuri.pdfIn PDF document text
    • http://sosipumetivebo.epizy.com/how_long_will_humans_live_for_in_the_future.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 5500 bytes
SHA-256: 3f88a1704e37dd7ce3ee148060b22104cba2e71090b964a5a7ac2800089c044d
font_01_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 11388 bytes
SHA-256: d782d25178f25655aaab6d94f895f8c45ac2bc2eca31e44f55a7df63e7a99ce9
font_02_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378