Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a226c6b571d580e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-10 03:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 25b8f29539e878ecd929b37f98acd4e0 SHA-1: 9f001fecf1b78f381dd173ec9cbc12778bb43698 SHA-256: 8a226c6b571d580ead0b98860483407ae8f9c3abf85420c70e4801340c8e7603
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/aws?utm_term=how+the+grinch+stole+christmas+words+to+describe+the+grinch PDF link annotation
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/narutubaruwa_zaxirameni_rojepalifudiw_xupemuj.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/cJ3idlk/83264364151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_5feaf3b06fffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fc9e84141fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/iihachi/boromevovelopiged.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/6925247824761ea.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/4190907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_603459e398737.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/kejumajego.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/kghJvzz/42204398956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_603b6db448b1f.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/1PjfNhb/pregnant_mom_baby_birth_games_caring_newborn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fd6fc73b6ecc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_151f1b6edbb44acb90359bd3d09e72b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b2c842-9fc3-41c6-8b01-40431d759fda/51753362735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa476750-e3e2-419b-b56c-6b2d0fab9adc/tewegofanufe.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_eb8e537bc934430e8e0ea4ff64494f94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/rajetoguninujabosina.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/sani_abacha_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/84794808847.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/video_clip_adventure_of_a_lifetime.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_85a0e12f8f7947aabe62c859980465de.pdf?index=trueIn 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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5544 bytes
SHA-256: 1a00b2105a2e069ba7d0dc4e592f46adc53e6cec594ec1f35bc9dd7070b037af
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 10972 bytes
SHA-256: 039c3fd30f4ab03b0196c03c026786e396d07cfd98c37812a9d0cf497f5e4ea1