Malicious PDF — malware analysis report

Static analysis result for SHA-256 706d87cf23e0151b…

MALICIOUS

PDF

80.7 KB Created: 2021-03-21 01:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 011ae9e946b6ee620b8a4df4830dc81a SHA-1: e91427827fd4b333d6b32c029945027375ae81a6 SHA-256: 706d87cf23e0151ba8befd8b387291417d0593a111197659e8a6c4c00d16095d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to host phishing or malware distribution pages. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=samsung+security+system+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc6d52dbe923.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/fanevagu-katisigifiratil-tarigonewi-tujijufagavu.pdfIn PDF document text
    • https://vavapeta.weebly.com/uploads/1/3/4/8/134848771/silumizadufiz_misakuputaxuxa_xogeseru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_6004190d2481e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_60348b501cde9.pdfIn PDF document text
    • http://youralteragoods.com/tiranukitibukaf2flk9.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/gawopavekoraduz.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/rawimu.pdfIn PDF document text
    • http://constructionhouse.info/juegos_de_cancha_comun_ejemploszvsbt.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/kibusixukefetupu.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/kobonope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutogebufuz.myartsonline.com/lekuragalegobas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aeb1f43-7cca-4e83-997e-54f190f19ada/zedewuduze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82035dc2-e8e9-4312-a8b7-e217f9617eb7/zonavufiziduruxoviwisa.pdfIn PDF document text
    • http://buwomonemagup.epizy.com/countdown_2019_full_movie.pdfIn PDF document text
    • http://lapizezevorisi.epizy.com/astm_e84_free.pdfIn PDF document text
    • http://sidukumu.epizy.com/65286527142.pdfIn PDF document text
    • http://sinipuxi.epizy.com/amma_kosam_songs_naa_songs.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/13997157887.pdfIn PDF document text
    • http://vipuzala.myartsonline.com/ansys_apdl_commands_tutorial.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/71271283764.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_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 5324 bytes
SHA-256: 3734a1cd6f1a4ab6984c0731198ba83c48a1adf13be031b4bd99a411e3b8a459
font_01_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10668 bytes
SHA-256: dc2fef21ab1f3846aef70649ee3be29c6f674ba5b605c54bcbcc756102beecfd

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