Malicious PDF — malware analysis report

Static analysis result for SHA-256 72db3db199a8358f…

MALICIOUS

PDF

96.1 KB Created: 2021-04-28 21:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1c7e938a89a15c6585612e15d4a47d25 SHA-1: 033f859b9e8971744cf278fc9ae25813e7796ea2 SHA-256: 72db3db199a8358f1493f714b182f314d91dc0bb3617f4eaea53101fe8645b17
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://nipisod.ru/strik?utm_term=what+are+the+zeros+of+a+sine+function PDF link annotation
    • https://cdn.sqhk.co/kotolodegag/ajajjhc/once_upon_a_tower.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/aZnTDic/jifewikigebusuwasub.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/Ijhicpr/music_player_device_with_bluetooth.pdfIn PDF document text
    • http://avit0.pro/definicion_de_serie_finita_e_infinita_calculo_integraluln37.pdfIn PDF document text
    • https://cdn.sqhk.co/jonimaze/jijj2hi/banajenumube.pdfIn PDF document text
    • https://dolufinome.weebly.com/uploads/1/3/5/3/135330980/pobozatujoge.pdfIn PDF document text
    • http://good-production17.site/923867639994dib4.pdfIn PDF document text
    • https://cdn.sqhk.co/binebelezux/igd21jc/query_to_check_invalid_objects_in_sql_server.pdfIn PDF document text
    • http://instapriz.online/juwefilixujaberenufakc2ex.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/xilib.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/igJjhdx/best_ninja_foodi_ground_beef_recipes.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/dadidosedejitala.pdfIn PDF document text
    • http://beliyden.xyz/download_enrich_your_ielts_vocabularybjps7.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/5727336.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/72251465054.pdfIn PDF document text
    • http://watertea.space/angular_set_value_nested_formgroupcggx2.pdfIn PDF document text
    • https://cdn.sqhk.co/puvivefujef/ajajbje/16551835657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nokakegobowu.epizy.com/wesafi.pdfIn PDF document text
    • http://misofex.epizy.com/padige.pdfIn PDF document text
    • http://lenukisevi.rf.gd/83074852166.pdfIn PDF document text
    • http://balukop.rf.gd/6663349368.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/doll_house_people.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 4884 bytes
SHA-256: 402b7cd0a991a51843d1703bc3088400db06f740f93f45de9dc4c29023c331f0
font_01_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 13212 bytes
SHA-256: d7626d664625f39001314cef4c7f3c7ca99ad61f64f6fa7ea77c7ff1c9c522cf
font_02_sfnt_off00014c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C77 16400 bytes
SHA-256: e05368720783ba12b72e94262ae1c58711b860e7e91985c2153664560af08473
font_03_sfnt_off0001628d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3