Malicious PDF — malware analysis report

Static analysis result for SHA-256 06894a287dc9d988…

MALICIOUS

PDF

98.2 KB Created: 2021-03-13 16:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1d844a46b82aec953536f9c258af00a4 SHA-1: a62515a4965540f3c960c1b40bbd9e21987e1012 SHA-256: 06894a287dc9d9886027d445e276c5b1c01b6b0bb699c9c43200ef6759afd953
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifies a link to 'dafemum.ru' as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload via the redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=juegos+para+aprender+ingles+para+ni%25C3%25B1os+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_6036f8143209c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fe687e15af82.pdfIn PDF document text
    • http://duxolaw.22web.org/fluke_77_series_11_multimeter.pdfIn PDF document text
    • http://fastcreditreport.info/berkshire_hathaway_letters_to_shareholders_1965pak85.pdfIn PDF document text
    • http://verifiedbadges-form.com/weferebejozujogaselimos6cdt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5ffc8211a06f5.pdfIn PDF document text
    • http://chestlune.online/basit_eitsizlikler_km_sorular_ssqwq15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_60244a4528265.pdfIn PDF document text
    • http://ubzvp.com/rajosufogobajaja1dkj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_5fee3808c22ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_6014e6db5b7d0.pdfIn PDF document text
    • http://nonretloli.site/zugaxepugebowiwululssb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_6033bdbc551b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_6034260f511c4.pdfIn PDF document text
    • http://it50off.pro/what_is_the_fee_for_usmle_step_1pw1gh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_6041f4406108e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidudovuj.epizy.com/android_auto_2019_review.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/countries_of_the_world_map_quiz_jetpunk.pdfIn PDF document text
    • http://ziwitiko.epizy.com/eeoc_reporting_codes.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_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 13268 bytes
SHA-256: e8a70edbdaf2200ef57543c9a185c74272187f2a98781292b3126f1196ca3e28
font_01_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 5408 bytes
SHA-256: 86c414615701ee04f016ac31b5ed579eb10ccf147745863cc82fe71c9cf320f2
font_02_sfnt_off00014fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAC 12504 bytes
SHA-256: c3f44ea4adf6d646663d49570c593a7d850d1df0927eeca06e713f17f9317a0c

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