Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e1997b37003408…

MALICIOUS

PDF

98.0 KB Created: 2021-04-19 23:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fae2e1f7cb8ae2843736d3491a0ad8c2 SHA-1: c2b050f8e6d28e15ae89c39024576a407f83f428 SHA-256: 88e1997b37003408e6a096c555f8ef4dcad7521435e0c5d4f213c67338e17473
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 domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=unknown+market+wizards+review PDF link annotation
    • http://distornyup.site/are_costco_protein_shakes_keto0rqa2.pdfIn PDF document text
    • http://bbcua.site/super_mario_run_world_2-_3_black_coins8sgjy.pdfIn PDF document text
    • http://skidki-day.store/autocad_2020_advanced_tutoriall7xor.pdfIn PDF document text
    • http://rent-nout.site/47285414348903ju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_5fe542cccb065.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/c7Nxqgj/mokaxiwed.pdfIn PDF document text
    • http://bitcoins-profits.com/is_hp_laserjet_pro_400_m401n_wireless413dn.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/j2hhvTJ/dynamo_sensitivity_for_pubg_mobile_emulator.pdfIn PDF document text
    • http://zoneeuro.pro/sniper_extinction_apkhp0ag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6039b3dd632e5.pdfIn PDF document text
    • http://presentinsta.site/46269739802mo84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_604656ae44891.pdfIn PDF document text
    • http://shoop-fo.ru/bepulibanomikojivemopueceb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384318/normal_600202ee82060.pdfIn PDF document text
    • http://retys.space/program_craftsman_garage_door_opener_to_car_without_remote8xrs2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417049/normal_5fc934f6b073b.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/gotenukevepunin/why_is_my_pellet_stove_feeding_too_many_pellets.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_fe8e1760fb294fbeaad493e36a163ff7.pdf?index=trueIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_1e73848b8bdc4cd68d534a048b75f8ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/bondhu_tomay_chandrabindu_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/bootstrap_studio_ubuntu.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_a08872642b6047178d164bab9a8762dd.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_2589c006c3574e038ce60660f9a7bfd3.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_off00013f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 5196 bytes
SHA-256: dbc77a8a0b442460ae0f373a575cf5d14b20e94bf7d3253410413e53e4a8f815
font_01_sfnt_off0001512e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512E 11780 bytes
SHA-256: 7147d691ecf72d25ba67c82bb49c0e5784a2dc510548ed01a27197496d2cfb7f