Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c9ee1acddec5b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 06:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 831f38741f227b30b7bae9718b393572 SHA-1: 21b0186c53864e690f86d65dca746a51c69fbce3 SHA-256: 319c9ee1acddec5b3ffbba3a9ca38b024fe26b66c5f9e8a3037ef0a1d078a0a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/123?utm_term=youth+football+shotgun+playbook+pdf PDF link annotation
    • http://dujufevotudamo.iblogger.org/how_to_read_and_understand_industrial_electrical_schematics.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/330448.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/michigan_common_core_standards_1st_grade_math.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5fe1e9d7f0287.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/lebabirawoli-xajujogomonej.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/23325316516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5ffd61ddc5950.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/12299331031.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/on_becoming_a_person_book_depository.pdfIn PDF document text
    • http://sobanurosu.22web.org/office_interior_design_software_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fe9573b99078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_60118c82e00ee.pdfIn PDF document text
    • https://lobepujijas.weebly.com/uploads/1/3/5/9/135966441/5abd77e3665d2d.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/vofadoloves/46835461309.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/beautiful_wallpaper_for_desktop_free.pdfIn PDF document text
    • http://jiboleramar.epizy.com/69908103783.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/uptet_form_2019_sarkari_result.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5472 bytes
SHA-256: 64b2cdfac632ef3accce53d345d9a4e91cc71fbd09107650a12c3104a2013ac1
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10488 bytes
SHA-256: afaf48acd0b27363ee044d662a3002c56c5a34abdf47f26d1922d22c67888d24