Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d7cadbe24f5f28…

MALICIOUS

PDF

88.9 KB Created: 2021-05-10 14:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1251292ca81deb894c4fab8d12d44c83 SHA-1: f3e6a205d0c1368d9553b10f4bf1269992af5ac8 SHA-256: 53d7cadbe24f5f28996c153c4e751853ecf528e8ed0909123ab7c4d9ac417ede
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The embedded URL points to a domain that appears to be a redirector for a shopping deal, likely a lure to entice users to click. The PDF structure and content suggest it's designed to exploit user interest in deals to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/strik?utm_term=philips+65+inch+4k+tv+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457318/normal_6007ee2bcae1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62fb8b5494.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/hDjhOan/conspiracy_charge_in_texas.pdfIn PDF document text
    • http://usejus.club/what_will_happen_if_i_exercise_30_minutes_a_dayp88yz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fe372e5e46ce.pdfIn PDF document text
    • http://phrensy.co/89206309866e3w03.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/gf0Hpja/buwis.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/basketball_court_dimensions_in_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/uhcidYm/94374395188.pdfIn PDF document text
    • http://secureappeal.com/how_much_do_wilderness_first_responders_makeehik9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_600e5a6a62bd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5fec48b3c6dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_605af1f3dfef4.pdfIn PDF document text
    • http://all-system7.xyz/xavosawg9ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5ff0caaa3694c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_602e36ef802ce.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/personality_quizzes.pdfIn PDF document text
    • http://vladmer.ru/nolorovapcxoqm.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/62629312544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vikukinumet/57518238958.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/110_volts_to_220_volts_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/what_does_a_flashing_red_light_mean_on_a_battery_tender.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/xegepedudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/wefetewapoza.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/43941014028.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_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 5316 bytes
SHA-256: 3806ccd0d87e159f3aaf67ce6cb1750bfccf38d449223390ca951f109c65d836
font_01_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 11392 bytes
SHA-256: 65e0596a280b068d1190dd25df64b6c6650d2f19afd815998e32c77ae975062a
font_02_sfnt_off000145e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34