Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19efada5ec04ac6…

MALICIOUS

PDF

70.2 KB Created: 2021-02-13 11:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 579b4852ca32df4efd1825df08c3418f SHA-1: 159251cffafe009c2baaf2fa66bf58ab49919a0e SHA-256: d19efada5ec04ac6a6ec380322ee379584804a925dde6b7b3b7d09c7f5b1e03c
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/aws?utm_term=brand+identity+questionnaire+pdf PDF link annotation
    • http://wogamilip.iblogger.org/vuniwixoduxemuwujo.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/bL4ij2g/white_chickens_with_feathered_feet.pdfIn PDF document text
    • http://gayerkan.com/sozofozuzowozuvakilasador5qp9c.pdfIn PDF document text
    • http://jetolad.iblogger.org/90898244172.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/Riijaab/88611069621.pdfIn PDF document text
    • http://ru-1.casa/mubukadunulituzidetuxabekc1gbk.pdfIn PDF document text
    • http://prolac.ru/545564482689ad7f.pdfIn PDF document text
    • http://tumbaa.space/ielts_academic_reading_true_false_not_given_practice50cv1.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/xijetupubavanomu.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/4842601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubabin.rf.gd/camera_scanner_to_pro_apk.pdfIn PDF document text
    • http://ruzupaxenerod.epizy.com/sap_crystal_reports_server_2011.pdfIn PDF document text
    • http://wepuwuzuvam.epizy.com/87193101135.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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 5280 bytes
SHA-256: a1466b22acd774f05483c87e970a01c5aeeb6f6c2fb2d47857ba002927d42229
font_01_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 11388 bytes
SHA-256: f57d6d943cc8087a9f0462bad002b451999f7fd79ff78f3be1fc83f2791de39a