Malicious PDF — malware analysis report

Static analysis result for SHA-256 4554de09fe4e3af6…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 21:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: faf46f6b787d355ee80f338517c5a3f0 SHA-1: aba2102c1d471efc4a3ed973569b8723996be5d3 SHA-256: 4554de09fe4e3af609c87dc30495dadbcec8ee51990d70cff88890ea022bb1b4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, likely designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=black+mens+cuts+2019 PDF link annotation
    • https://cdn.sqhk.co/bomemenun/Udo7jhA/anti_stress_relaxation_toys.pdfIn PDF document text
    • http://groshyk.site/400714583313qvld.pdfIn PDF document text
    • http://babysampler.com/77739323762s7k17.pdfIn PDF document text
    • http://lessonsonline.site/chocolate_cake_recipe_without_icing_sugarixqd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6037834e82edf.pdfIn PDF document text
    • http://formulamoney.top/174762220996fu3d.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hiK3BcM/bikes_hill_record.pdfIn PDF document text
    • http://mabay.fun/amarnath_yatra_doctor_list_2018f5orl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5ffbd2aebfbe1.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/8jbGFhT/shogun_sushi_and_hibachi_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/jjjfIii/57617201736.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/69heROx/gba_emulator_ios_12._3._1.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ojj9wjj/kingdom_new_lands_guide_statue.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/icwjfja/dancing_monkey_live_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_5fea13e5cc684.pdfIn PDF document text
    • http://interstart.online/the_hunger_games_mockingjay_part_1_full_movie_free_on_youtuberhqcc.pdfIn PDF document text
    • http://girlsbeach.space/coleman_serial_numberms7yw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_f60118a0a2b1466495ae431f51f3dbaa.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_16f6d504070c4a28a59cb8b44ceec510.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_69ba9fffec3443d997701540fef07867.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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 5444 bytes
SHA-256: 823050c2e6ae631930585b5bf6bc46f579c882f6daca6e06c4adb3cb2fa75f86
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10448 bytes
SHA-256: e4c311ae0f620e34e2bb38ea3fb8a162b3b0ea2f683300066fd26b0a2f7484bf

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