Malicious PDF — malware analysis report

Static analysis result for SHA-256 4331331f5b8fc22b…

MALICIOUS

PDF

77.0 KB Created: 2021-02-08 18:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a2f3028575c7d81bdd5d568d413a9134 SHA-1: 50c906688b99087c4b438c3b8534d9aced5c040d SHA-256: 4331331f5b8fc22b5e7eebd241e3edb194fb8e3c00b641357b765c53648c6ed5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/aws?utm_term=html+tags+pdf+bangla PDF link annotation
    • http://hookup158.fun/change_cash_app_to_personal_accountdvtpr.pdfIn PDF document text
    • http://svoylend.xyz/cms_ed_medicine_listdn5va.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/A8gehgA/10842429121.pdfIn PDF document text
    • http://ersoil.fun/bow_staff_kata2euyn.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/3hiWQgg/car_racing_shooting_games.pdfIn PDF document text
    • http://vovality.club/minecraft_cape_skin_packzezd7.pdfIn PDF document text
    • http://obschee.xyz/saluxovomopevabpzvu8.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/hhb7ibf/96022428322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_601af3f73eea4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5ff8ff8835954.pdfIn PDF document text
    • http://kapusta.pro/buku_humor_sufinhkey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5ff60a5ba1b25.pdfIn PDF document text
    • http://mmmuuuue.space/interesting_facts_about_spain_cultureipl04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudetelutineb.rf.gd/chemical_properties_of_calcium_carbonate.pdfIn PDF document text
    • http://serepuzokoz.epizy.com/aoki_densetsu_shoot_batch_sub_indo.pdfIn PDF document text
    • http://zumoriko.epizy.com/joining_report_after_completion_of_maternity_leave.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/address_format_letter_us.pdfIn PDF document text
    • http://lorajazibosiner.epizy.com/gotta_go_fast_piano_sheet_music.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 5364 bytes
SHA-256: 98094327326e03000fb33e73bff0bb4d41f687e4d17ac30c716a57e0dba16836
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 12476 bytes
SHA-256: f7dd53c13ad2024673a6d9243632b45ef1956139fcdc38f91d5da6702f10321b

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