Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3868c4633bafb2…

MALICIOUS

PDF

74.0 KB Created: 2021-02-13 05:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9a5a39090eefd87d1aa8f3c13c5fd55 SHA-1: 83b893c7b6335d75889cb58adf1f6c6a74463b73 SHA-256: cc3868c4633bafb2499686398067cb1af39fce69826ac47cc371af5183fa287a
226 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to disposable domains and likely serving as part of a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the PDF_SUSPICIOUS_LINK_LURE heuristic suggest the document is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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/wix?keyword=august+ahrens+elementary+calendar PDF link annotation
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/5395436.pdfIn PDF document text
    • http://umkatrade.ru/animal_jam_play_wild_free_membership_codes_2020xem6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5ff7e12574b0e.pdfIn PDF document text
    • http://baykamif.space/vrsf_downpipe_fix_instructionsbh75g.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/BOtZhdo/cat_evolution_clicker_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/jbgcoGs/coupon_keeper_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_60089f935e147.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/iaifi8t/cake_cooking_making_games.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/52ba5238b59ed.pdfIn PDF document text
    • http://findattime.com/castrol_0w-_30_data_sheet1mq6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_602025ad90869.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/runejadonibomaz_witibogepavo.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/laveretogifekegjrqe.pdfIn PDF document text
    • http://verifybadgesbusiness.com/assignment_problem_in_lppiqz5y.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/aichbXU/evolution_synonyms_in_different_languages.pdfIn PDF document text
    • http://copytoshka.ru/smart_assistant_oppo_f17_prom04l7.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jbgg3gg/fernanfloo_stream_twitch.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/rubidokezive/canned_corned_beef_nutrition_information.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5444 bytes
SHA-256: 8f61c52513dd26e5e4f9d5c8cfffb4a813cc21dc06cdbf8655c67d82e3c04d21
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 10588 bytes
SHA-256: 3a163af5f951272d4c0e076d41eb0073c22004be5438ce4a8208500500f6e36a