Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aacc7f0ed3602b2…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 12:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc6fcfbd6cbd0441681084a4b9d96cfc SHA-1: 442c41a6e404a6ea6bf0b6f6cb1d9c8623f68478 SHA-256: 4aacc7f0ed3602b2716b871afb866f2934b4b535f5147f15790e270bb5a8a9db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9988

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://maypoin.ru/strik?utm_term=penny+stocks+2021+india PDF link annotation
    • http://tronreserve.online/bidebobinuvhx2k.pdfIn PDF document text
    • http://rijafinawaxus.iblogger.org/5283147629.pdfIn PDF document text
    • http://anrostore.ru/download_video_karaoke_someone_like_you_by_flavourp3of7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_60300c5f716e0.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/battlenet_slow_speeds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_601a5750c5ae9.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/jfibvih/25635854137.pdfIn PDF document text
    • http://rubeatyshop.xyz/dikafikl80d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_600d6bf8c5e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5fec1098b0632.pdfIn PDF document text
    • http://reduslim-shopofficial.site/packing_list_template86sbf.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/MhcjgUX/amazon_alexa_black_friday_2018.pdfIn PDF document text
    • http://vpntop.info/albion_online_android_won_t_installarr3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f6211d3291.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/icPMjcd/94871165240.pdfIn PDF document text
    • http://net-klientov.ru/corel_draw_12_guidekijnv.pdfIn PDF document text
    • http://sokolov.fun/diy_horse_run_in_shed_plans4agbo.pdfIn PDF document text
    • http://dle-tpl.site/science_world_2_textbooko4lyo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xebiramipi.epizy.com/68392178671.pdfIn PDF document text
    • http://zogujiduguku.epizy.com/58877345545.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 5296 bytes
SHA-256: 180c47540dfdc76c91b4c486b96a66cba68825ad9a423fda68a5eb782dc64b68
font_01_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 11052 bytes
SHA-256: 375b107f1ac84a92659e7b492fa7f0c6c5cfe6586566635e328a686b83bc1b51

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