Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b37e8cd8dfb446…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 06:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 051830d0a5ff5ad485911d3b0f416e02 SHA-1: c11be397d1eeccc07b3327630be24c3ac8bf0bf5 SHA-256: 72b37e8cd8dfb4468be307780c81d9150adc1eceea9a07ed6effe2819262f7d0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting sites. The embedded URLs, such as https://xajibur.ru/123?utm_term=nice+guidelines+sepsis+under+5, likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://xajibur.ru/123?utm_term=nice+guidelines+sepsis+under+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcfed1aa79dd.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/18526328514pqvee.pdfIn PDF document text
    • http://reactivascotia2020.com/42184190957ijrr2.pdfIn PDF document text
    • http://gelchlen.fun/maya_angelou_caged_bird_bookscm4l.pdfIn PDF document text
    • http://trelon.fun/lexispaper_offline_wikipedia_dictionary._comqwiud.pdfIn PDF document text
    • http://olipaka.xyz/mind_power_into_the_21st_century_free_downloado7dqz.pdfIn PDF document text
    • http://ledimpress.biz/what_kind_of_oil_does_a_2008_lexus_rx_350_take0pawt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6028f12a06f76.pdfIn PDF document text
    • http://podarokinsta365.site/how_much_is_the_salary_of_an_aircraft_engineervu1oz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdc14cb7d70b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_602894c300ea2.pdfIn PDF document text
    • http://inertbhjbj.ru/tensor_calculus_vs_vector_calculusncrft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fcb3dbd94699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_602528a675fac.pdfIn PDF document text
    • http://agent-spv.space/sowixiwusatwrqas.pdfIn PDF document text
    • http://geosen.net/57997095164pq7k0.pdfIn PDF document text
    • http://gta-msk.ru/waterway_sand_filter_reviewss7r03.pdfIn PDF document text
    • http://hustlinmoney.com/deer_hunter_2018_mod_apkyk276.pdfIn PDF document text
    • http://stroymarketmetal.ru/ripitigeromovodojixoro63kbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_60289dc46ea20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7400be88-314a-4d39-aa58-0f2065463fe4/chicco_keyfit_caddy_stroller_frame_buy_buy_baby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8071f24d-b442-4b65-a666-9ce8174a41e3/88327051119.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_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 5124 bytes
SHA-256: 4488f71114f56ed7ad4907d8f64b7b00e434820a5d2e90b5be3f7b452e8ee327
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10852 bytes
SHA-256: 531b8705eee113fcabbdf5c715e002e94cc6ad19b142306adede56dff0d811d1

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