Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13995f095885191…

MALICIOUS

PDF

79.0 KB Created: 2021-03-08 03:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 31a605f2487f1cf1cb717c1805a1f573 SHA-1: 5d910a0e1cdd1c968281d286454d92c905f899d8 SHA-256: b13995f095885191426afd7f1ce2bb73d1ac44942cd9e3b87d22e2e86b3be613
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=need+for+speed+no+limits+mod+apk+unlimited+gold PDF link annotation
    • http://bumasujofoj.getenjoyment.net/iphone_5s_instruction_manual.pdfIn PDF document text
    • http://clyb-wylcan3.space/98495414714qv7an.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ggiihaV/rider_university_job_board.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/mubotamelipejamopeba.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jGtje11/card_tower_challenge_team_building.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/hhb2NtE/dotutimikafagapekuves.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/kidamexufabuwewasilena.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/dgcSheY/punisher_skull_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/fanalotozor/gcmicei/36992371650.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/FiaSgdd/beyblade_burst_app_download_obb.pdfIn PDF document text
    • http://takipleskazan.org/napofuzimln4qs.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/lelewafotizun.pdfIn PDF document text
    • http://supermagazforsale1.xyz/jevitor3d76o.pdfIn PDF document text
    • http://gekalam.22web.org/jinufonipajozusuwatuwilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1bcc7f-b15f-4cab-9853-ed91717a7cbe/56828490464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bad5ee0-72d4-40b0-b881-f67b816d2a3a/79903324774.pdfIn PDF document text
    • http://wiletuwad.epizy.com/us_geography_trivia_questions_and_answers_printable.pdfIn PDF document text
    • http://nimozan.epizy.com/xmanager_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78c0f08-9169-4325-a20b-00288cc401c6/how_to_carry_baby_in_baby_bjorn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb9b006-b3e9-4420-ba35-70023281a576/latuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17beed7f-dcfa-4123-b7e4-f5cc77fbad7e/gta_v_premium_online_edition_ps4_offline.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/degigilivunopirafajadaj.pdfIn PDF document text
    • http://latevafizatum.rf.gd/zorurigulenagosetedebaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5396 bytes
SHA-256: ec161ea18d0cca67c91cdf860fe473b141ea53e43525c01dbb3d7a3902403de5
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 1584 bytes
SHA-256: 0873ae4fc3b6c74ba55850487b50739c43c0ca2ec1dc3dd9da096b91d3babf70
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10644 bytes
SHA-256: 4466f9ab0753d93178ca519e1069e97237f94bfb37d65c380b03ac49beca30d1