Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ca761bc8f92b65…

MALICIOUS

PDF

74.0 KB Created: 2021-03-06 22:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 579fc64790201eb5388b13957c20342d SHA-1: 447c9616db886906e7fc645c28642a620d88b68c SHA-256: c1ca761bc8f92b65261c4165a05ee4b6f1c5ce3e60a500b470c744c7077b557b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The PDF's structure and embedded links suggest it is designed to trick users into visiting a malicious site, possibly by masquerading as an award notification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=without+repentance+synonym PDF link annotation
    • https://cdn.sqhk.co/wesuwajil/gwig5kB/doctor_kids_set.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/xhenieU/88025494068.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/gdQgctT/60543937727.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/nnggidB/winter_birthday_party_themes_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/wxnjeRE/mukti_camp_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/ajchiib/nadigijivujidebuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/oqgfie4/rush_rally_3_download_aptoide.pdfIn PDF document text
    • http://xexajume.iblogger.org/59355948295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_602f8c36a0c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5ffe640b6ec9e.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/gfpfVgf/hocus_pocus_spell_book_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fec7a7a2d4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fd981fb0d897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_5fd0f2c231446.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/feliso/23956961432.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/google_chrome_32_bit_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b3953b-5bf4-4867-b2e1-dfe7c6db9f88/duwevezotisusuweko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05aec8a6-fccf-473f-ad50-951291c35577/game_answers_word_stacks.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/cubase_5_free_full_version_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77ffd1e-7a74-48d3-b6fb-7e6e1d9431ea/27753234682.pdfIn PDF document text
    • http://tofedig.epizy.com/guidelines_on_exclusionary_abuses.pdfIn PDF document text
    • http://teguxivufir.rf.gd/spirit_airlines_information_about_baggage.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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 5256 bytes
SHA-256: 8f003e3e114bd2b5f17d3a5f95f7a85ac410b94afaeda6c6b3dbc4102d9026bb
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10180 bytes
SHA-256: 618a93f2bdeba082c23c00addfbbd991dc3e040d0871a75156bf5dfec4367090

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