Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffe983e2d5d5688…

MALICIOUS

PDF

73.4 KB Created: 2021-03-17 20:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 33979abdd78884bb2d25e5b193f965b3 SHA-1: 199b6d4dc2d7d5d7f6e196e372f1785b7ba88d8d SHA-256: 5ffe983e2d5d56884df6120d101f7bfc741d9f649be11423eb773b841bebbe1f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML and ClamAV as malicious phishing content. The embedded URLs suggest a phishing attempt, likely to steal credentials or lead to further malware. The presence of external URIs and the ML classifier output strongly indicate a phishing attack pattern.

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://nipisod.ru/strik?utm_term=elements+of+music+textbook+pdf PDF link annotation
    • http://kogejirupu.getenjoyment.net/cockatiel_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601d326f6ddcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fe1bb0e0f4b0.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/how_much_is_a_kindle_fire_hd_7_worth.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/what_did_the_third_estate_include.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/gfYk8nb/white_eyed_crocodile_skink_care_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/AheoTZj/top_10_dj_sampler_apps.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/algebra_2_textbook_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fedefuxu/duLRUia/jufigafifavepilonifinoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/zamupefa/ijeIrIG/flappy_bird_game_maker_download.pdfIn PDF document text
    • http://naxenavuk.22web.org/56031986258.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/33hiPm9/jetakovuvepudusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fd6810eeb82d.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/341aed54-9740-4246-987a-94303d547182/what_to_do_at_a_final_inspection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3334f634-38c3-4963-b4b9-9a8fa018a41f/86830143919.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/bubble_game_for_pc.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/tiniretejola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00139768-7695-47c6-8ad7-3fc3c06b8b17/dugilode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d98ba6e-05a0-4f51-a57d-c41f0595c970/88765225359.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5224 bytes
SHA-256: 7c4a51524618b0ff8992294321d8989c07f0a17f80b5dacb4b3775f957598a14
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 11360 bytes
SHA-256: 0087cbc3cb7cd80bd2938d22bebb461b9d33083393efb2bec9332285e9cb944f

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