Malicious PDF — malware analysis report

Static analysis result for SHA-256 263f4446337fdadf…

MALICIOUS

PDF

77.4 KB Created: 2021-04-29 19:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b805752aa95bacc9ee82da24ec56a5 SHA-1: 72ced6ec392ab0ce3b17d1a5e8f4a41e8ce3d73f SHA-256: 263f4446337fdadf0403bb077f6d626bc79be8025c497590151f1c4636cb4e0a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'ADHD in children' which redirects to a URL containing a similar query. This indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=que+es+un+tdah+en+ni%25C3%25B1os
    • https://namulore.weebly.com/uploads/1/3/4/0/134017746/levexitex.pdf
    • http://kunepuvobimamin.medianewsonline.com/are_duromax_generators_any_good.pdf
    • http://watepavamosem.sportsontheweb.net/us_high_school_biology_textbook.pdf
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/buguti.pdf
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/ea642596a2.pdf
    • https://cdn.sqhk.co/nefijisob/chaEItH/75769423235.pdf
    • https://zeduwekikozive.weebly.com/uploads/1/3/6/0/136050246/88b9b58ed22aafc.pdf
    • http://vopagokiniki.mypressonline.com/castration_in_dogs.pdf
    • https://cdn.sqhk.co/tifesiwafo/eicRW4G/59829664505.pdf
    • http://nebofonuve.mywebcommunity.org/basic_spoken_english_course_syllabus.pdf
    • https://cdn.sqhk.co/salobosemiv/BggjhhX/land_and_water_forms_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4471256/normal_60356a1e73297.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6044d016dc3c1.pdf
    • https://static.s123-cdn-static.com/uploads/4490724/normal_6005b9ddaf850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bidexegope.epizy.com/mofidujisi.pdf
    • http://safonakidu.rf.gd/clinical_research_associate_job_description.pdf
    • http://gixiluvigatekij.atwebpages.com/agrometeorologia_murphy.pdf
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_dd88f4a5d36e49ac96d9a5fb95f07082.pdf?index=true
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_ae9be78bfe5b496cb0dd297d723fdccb.pdf?index=true
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_da409f53e1104c6db2106cd770ddd668.pdf?index=true
    • http://jizokiw.rf.gd/48839709902.pdf
    • http://wuwepapose.epizy.com/ximoboge.pdf
    • http://bimivopi.epizy.com/narasimham_committee_report_on_the_financial_system_1991.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin
da41b3d2404aa4425db2da5af18ca48297b4cda3c20e8c9a961f084b9beb0f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 5056 bytes
font_01_sfnt_off0000ff24.bin
c15bd1a6738e0c37710b3676279b07883b0e48ad111023a587fd656aa0034e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 12244 bytes

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