Malicious PDF — malware analysis report

Static analysis result for SHA-256 045758a7ae33b6e8…

MALICIOUS

PDF

72.8 KB Created: 2021-03-01 00:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 34067acf629f8554ad94096a46dda169 SHA-1: 77a711968cf35c045ab21862352f27a0f0cc4f95 SHA-256: 045758a7ae33b6e85569b6833ea9ef255f730be5d28b9f760c9c93aebf43d925
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed and point to various PDF documents, suggesting a link farm or SEO spam operation. One of the primary URLs, https://botokaw.ru/strik, is likely a landing page for further redirection. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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/strik?utm_term=what+is+iso+ts+16949+standard+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379610/normal_6004d9cf788c1.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/xogoxiwewolife.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hgKVtUZ/juegos_de_stickman_dismounting_gameplay.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/gafedarabididip.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/ie94iih/car_simulator_2020_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/dIS9jc1/49108734212.pdfIn PDF document text
    • http://abzac.me/how_to_set_up_voicemail_on_samsung_galaxy_a10eqh6yo.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/hbVhjhi/50124942088.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/xisakazelelinim/ariston_water_heater_manual.pdfIn PDF document text
    • http://xidozex.epizy.com/significant_figures_practice_worksheet_key.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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 5560 bytes
SHA-256: 76fcf0da03e83937550b195d5855b2370debe185eb6523de83d350142ded0566
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 11116 bytes
SHA-256: 456552b9a6522691f0b34898be8c88d84e014aea2457adbcf2478e0a339d607f