Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd2a5729b4ed4e…

MALICIOUS

PDF

74.3 KB Created: 2021-05-09 11:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5ab09d16324680c3030364df76893fcb SHA-1: ff6b8ff1175da116ed14add20f4470a3bdd729c3 SHA-256: 67bd2a5729b4ed4ed9df9a212e584fa9f13a21b195ae101bb771d0b357568d93
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL `https://jacksth.ru/strik?utm_term=decal+application+instructions+printable` suggests a lure to download or navigate to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=decal+application+instructions+printable PDF link annotation
    • http://lukufogud.getenjoyment.net/near_infrared_spectroscopy_principles_instruments_applications.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://deronagebe.iblogger.org/naming_organic_compounds_with_functional_groups_practice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600b60378c136.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/uc_browser_video_apps.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/tactics_ogre_let_us_cling_together_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603780b87ce5f.pdfIn PDF document text
    • http://nature-ital.space/19165297254c3uni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_6060656f556cf.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/dizaxekedoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_603dc577eb35f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fff9c38b16ab.pdfIn PDF document text
    • http://luxshop21.site/88503146658dvtfh.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/ravuxudibure/23698621907.pdfIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_b1fa7a98fd214e8eb9c8b497ee1aed08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/wegogun.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_3836a9f36b564286b4180cabbe4d2aa0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/english_sentence_formation_check_online.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/samsung_sew-3037w_monitor_only.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d2defd0447e240f891e8f19ac40cd9b1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 5064 bytes
SHA-256: 7bcfe9e15d0bf8014839976730b2eb2764fadea985b6c2303bc9ca1497f08951
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10928 bytes
SHA-256: b1862692c84be6bd9b24f94cc9b31f98ad3b3e1008f7924651fa313dbd1872d7

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