Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f0213adc3465a0…

MALICIOUS

PDF

76.9 KB Created: 2021-02-19 13:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a714601ccd3da5b44250037b065e63eb SHA-1: 4ff9095eba951d68d899e9e20eb02bd7e5ec6fca SHA-256: 85f0213adc3465a0a1f86030ee7b8e95d7f032ed411f6bd7d2f3bf02e8cb584f
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it's a phishing or malware delivery attempt. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, designed to redirect users to malicious content. The presence of a known malicious redirector URL further confirms its malicious intent.

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
  • 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://yafferge.ru/wix?keyword=ap+psychology+chapter+3+study+guide+answers In PDF document text
    • http://flowerport.shop/malayalam_album_songs_free_mp4314la.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/fulufal-luzudolijej-wumexerifizadi-fovot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454545/normal_6005f60fafcb3.pdfIn PDF document text
    • https://cdn.sqhk.co/kususarefeja/KgcHGhf/kuzenaleropomevegobonova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_601074113f3a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5ff531717cfa4.pdfIn PDF document text
    • http://fakaripeti.xyz/2020_football_schedule_south_carolinatxxiq.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/jioiege/vw_tdi_auto_to_manual_swap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fdf8f552901a.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/1901911.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/Ihhz4id/ant_killer_spray_indoor_and_outdoor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_6003721e83063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6025f489c8893.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/iiWidei/gurelirewimuvorewubovarom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_60158ea4665c6.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/saraverex_dejifaw_rifikelulik_xozaxiduwuri.pdfIn PDF document text
    • http://italia-doc.fun/sulalafoliwulezoxob43nk7.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/wigedis.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/vabedafozo/pakason.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/domozi.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/973639031.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5684 bytes
SHA-256: 25f218598c268ad9b3fab2ecfb8e6bfd7d9228f2aedd54ac60b555c0bedd525d
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 10412 bytes
SHA-256: 780026471f0c041b1daa8107580329a6d1214b1489ad33a74c1e2728a0843463

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