Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37c603dcf1dd368…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 10:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 815b0f1f5a941f61e4bb9a6ddfce28d5 SHA-1: 1a83e92a560360c9815bcf5ecb2c462b75116e46 SHA-256: a37c603dcf1dd368f9d19dba4eecd873407271167101ab6a6252e6a0bb999d90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'days of the week in russian pdf'. The presence of external URIs and the ML classification strongly indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/123?utm_term=days+of+the+week+in+russian+pdf PDF link annotation
    • http://fegivate.medianewsonline.com/centigrade_to_fahrenheit_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_601d84e63d1aa.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/vupanemevezagiwetusakopuw.pdfIn PDF document text
    • http://piredvizhnik.com/aadhaar_card_printing_software_free3its2.pdfIn PDF document text
    • https://tupumerar.weebly.com/uploads/1/3/2/6/132695397/3e735c53e29bf1.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/somewhere_over_the_rainbow_israel_kamakawiwoole_chords.pdfIn PDF document text
    • http://venubur.22web.org/what_does_the_word_quantum_mean_answers.com.pdfIn PDF document text
    • http://keepqifi.site/sorefetugu797nd.pdfIn PDF document text
    • http://lightsex.ru/89700746410na3tg.pdfIn PDF document text
    • https://bivibonade.weebly.com/uploads/1/3/4/0/134041173/modomuwevugubi.pdfIn PDF document text
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/xapevimokix-fepemu.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/refaxigax-bofesamafe-jabiramu-simejopu.pdfIn PDF document text
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/riwogajowof_jeten_mavojovomikoxis_lanenatobuz.pdfIn PDF document text
    • http://fimewot.xyz/ribojupakemefewamezubixamvb0zf.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/2091403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5ffed35ba011c.pdfIn PDF document text
    • http://powakuvape.22web.org/los_5_lenguajes_del_amor_de_los_nios_gratis.pdfIn PDF document text
    • https://waxopudiva.weebly.com/uploads/1/3/4/6/134695928/13ad7ae4dd2597b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_601faff15c2b1.pdfIn PDF document text
    • http://prosale.company/383942555178tgod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasewuji.epizy.com/best_performing_managed_funds_australia_2017.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/kovubikimomobi.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/zexisukasuxe.pdfIn PDF document text
    • http://setuvufijub.epizy.com/structure_of_monosaccharides.pdfIn PDF document text
    • http://sevuvev.epizy.com/savalowerak.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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 5356 bytes
SHA-256: 38e5908d981746e632d33403105685adb20571aa0888fb89968207354b1c31d2
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16088 bytes
SHA-256: b6076ed1e007da015cc8ee7ca2a1002222f3bc8f046a6bee117a579cc9d47198

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