Malicious PDF — malware analysis report

Static analysis result for SHA-256 4102fe88930bb76f…

MALICIOUS

PDF

94.8 KB Created: 2021-04-01 11:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 583f58bbb15db8f699f10a34076581c1 SHA-1: f2208379167f1bb882b8542883f81cda34c4d20c SHA-256: 4102fe88930bb76f7cb83442112ff827b51fba56989e817895d04ea9864aa8fe
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating suspicious links and a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using deceptive links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/award?keyword=global+branding+strategies+pdf PDF link annotation
    • http://form-lnstagramcopyrightservice.com/animal_personality_test4qh0d.pdfIn PDF document text
    • http://lnstagram-support.live/592116862746v5ii.pdfIn PDF document text
    • http://livecopyrightverification.com/kunixafomudupisoxobstotj.pdfIn PDF document text
    • http://remontlegko.info/eso_imperial_city_vet_guide4gily.pdfIn PDF document text
    • http://pedron.fun/tolakawegegokalunogcft.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/iCFjhhd/pewdiepie_merch_face_mask.pdfIn PDF document text
    • http://123dutch.com/lego_harry_potter_1-4_hogwarts_mapxpf0s.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/gHgdnjg/mikesi.pdfIn PDF document text
    • http://lnstagram-helping.live/free_ac_dc_ringtones_for_iphonek0xg1.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/87ih26w/28440541553.pdfIn PDF document text
    • http://gbarb.me/62733498458l8pvp.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/FxB5bhe/kgf_mother_sad_ringtone_download_pagalworld.pdfIn PDF document text
    • http://copyright-notice-ig.com/searchview_code_in_androidosj71.pdfIn PDF document text
    • http://znatural.space/gemotulezefofu5vegb.pdfIn PDF document text
    • http://hopecommunitynaz.com/what_book_goes_after_the_last_olympianpnqy9.pdfIn PDF document text
    • http://idealsit.space/ipod_touch_4th_generation_battery_replacementnb8s8.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/learn_russian_alphabet_gamex8c1s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_b82bd74ea8ee434d9729c1f929b2486e.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_def39a243def4691b5a478235db3359b.pdf?index=trueIn PDF document text
    • http://dorofudi.epizy.com/android_studio_google_sign_in_button.pdfIn PDF document text
    • http://geperazal.epizy.com/comprehension_worksheets_ks3_uk.pdfIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_9ba782d8e5dd4d89b9a688ca75e7b33a.pdf?index=trueIn 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_off0001370e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 5380 bytes
SHA-256: 0348c35511c15255686e1a336486c5cf3b3525f929ac83dc407ded83e92fffdc
font_01_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10812 bytes
SHA-256: 55c72986d1f78461c125609449eae7b53e96c2b5ddefcd6f1897175d2a8fd7ae