Malicious PDF — malware analysis report

Static analysis result for SHA-256 54544c0a210ed61c…

MALICIOUS

PDF

85.4 KB Created: 2021-03-05 21:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a667945bbd94a4960312c1ed5112f7c5 SHA-1: 230417246f9f2278161f31c7506779973cf5470e SHA-256: 54544c0a210ed61c4d5b41627b49a2969c59c0c332a39df72cd75b642b65acca
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing or trojan activity. It contains numerous external URIs, with one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and embedded links align with techniques used for phishing and distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=charles+bukowski+best+poetry+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601de152bab7d.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/bggOarA/business_standard_newspaper_price_in_jaipur.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/vetafoxun.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/gcaOgfk/among_us_online_no_download_multiplayer.pdfIn PDF document text
    • http://doctorzlo.com/711858565445f7ua.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/gdvhYfb/add_ifttt_to_alexa_routine.pdfIn PDF document text
    • http://baltika-trans.com/planet_fitness_black_card_membership_promo_codex1n8a.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/36lhdjg/zombie_idle_defense_mod_apk_1._2._0.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/vhihaif/adventure_island_classic_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fe296c344ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/giicgjd/home_painting_cost_estimator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5feaebe036b49.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/51gigh0/kokapazabut.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/eEiaibg/rabajixifadolibiwujofis.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/UMxvYhg/71397133112.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/gd7K3jd/car_crash_maximum_destruction_mod_apk.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/fowonaxul/kuginisepuvowide.pdfIn PDF document text
    • http://numebazo.rf.gd/wevikarogunolosonadiwor.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/69460449906.pdfIn PDF document text
    • http://magonusu.epizy.com/illinois_uniform_crime_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/kewavadixomari.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/notujevumunivepanodawew.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/81637725827.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_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 2900 bytes
SHA-256: 3f5c63f470a591e9683349e852e2e1dedda183ef0e7d2ccc20a242f3990e2397
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 5208 bytes
SHA-256: e9d0ee520aebefd195c913626df7cbe31734ab83ab71d34960b3cad4b8447a77
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 11104 bytes
SHA-256: 977efee2a4178dfb0d6711441918b780e2270ef17f273c7480d07acd571b8d90