Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e87a4c5425c761…

MALICIOUS

PDF

72.1 KB Created: 2021-03-22 13:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c0e529bd5083558ba3e3b2065e4bef70 SHA-1: 375871fc1f4f4b3e0cd21aa75bddcd50dc9bf36f SHA-256: 92e87a4c5425c7614b89d985c9b36b6d22f0177b763d18ae52e257fce760dc37
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 0.9991

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://xezojetit.ru/wix?keyword=double+homework+episode+14+newgrounds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fc86cdb20d75.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/gagirutuxilabegugajusuma.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/xapepetobivuwerazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_601c9433de0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fdc6fd845b16.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/firefly_video_otoscope_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcbaf3d70a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_603bc551a74c8.pdfIn PDF document text
    • http://dipijefowisadu.iblogger.org/is_amazon_prime_on_playstation_4.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/vurerepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5feb225a47aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_5fd907bf7cf94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fd1c6b2012de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcb6685cce1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_603faed6616c1.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/pusokodirikokasosiwuruw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_602290ae8c002.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/xeroguru/love_me_if_you_dare_movie_ending_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/discrete_and_combinatorial_mathematics_an_applied_introduction_by_ralph_p._grimaldi.pdfIn PDF document text
    • http://sovizaz.epizy.com/public_finance_act_zambia.pdfIn PDF document text
    • http://xamipekuxedatif.rf.gd/68170247885.pdfIn PDF document text
    • http://kipafiperugava.epizy.com/nebuwulaza.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/47109834031.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/phrasal_verbs_with_meaning_and_examples.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 5596 bytes
SHA-256: bbdb1dc0fe2b4e88406127dc5da857a61bff50d9f63c9c534ab43918e471dc00
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 11456 bytes
SHA-256: 97d078450083b7dbc202a065cdfa919327b176d2b832caebd5bf5dfeb08cfbb8