Malicious PDF — malware analysis report

Static analysis result for SHA-256 6538eb3bbdbd84cd…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 08:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9054b1bfd1fae862f97fed1094099f1d SHA-1: d6ac35ad311c9f85d1a0eb6b7ba82cee239dfba1 SHA-256: 6538eb3bbdbd84cdd750074a97957ed5c22d3b10a24e9a15b946ecfd5a2216a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to an 'Algebra 1 midterm exam with answers'. The presence of many external URLs indicates an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=algebra+1+midterm+exam+with+answers
    • http://befotuke.mywebcommunity.org/what_does_time_and_space_mean_in_a_relationship.pdf
    • https://cdn.sqhk.co/xifobariw/cihifW7/underhand_throw_definition.pdf
    • https://cdn.sqhk.co/vejurumilef/jcid1kV/catfish_cooley_wife_instagram.pdf
    • http://gajonedorebuko.mywebcommunity.org/xixebubekojiwewofesepo.pdf
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/3844760.pdf
    • http://sufawevugut.mywebcommunity.org/calendar_2020_week_numbers.pdf
    • https://cdn.sqhk.co/dodamewope/dghidY7/nobububuxiwadaxad.pdf
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/dusasowasagew.pdf
    • https://cdn.sqhk.co/nizekidido/ghjjhd7/33111836372.pdf
    • https://cdn.sqhk.co/jelasusoved/nicjiie/results_for_champions_league_2020_2021_calendrier.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagobomap/disputing_errors_on_credit_report.pdf
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_8e33f462787f4fdeac606fdf076fb17f.pdf?index=true
    • http://rosajeku.myartsonline.com/are_schwinn_spin_bikes_good.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/arunraja_kamaraj_all_songs.pdf
    • https://s3.amazonaws.com/nuxulikiwab/cookery_10_pretest_answers.pdf
    • http://biwefejiza.myartsonline.com/estrategias_de_aprendizaje_definicion.pdf
    • https://s3.amazonaws.com/putelekireza/reading_worksheets_for_esl_adults.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_123060d60c364e419bff3b2f64ca9014.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/pifunibak.pdf
    • https://s3.amazonaws.com/donake/zokosisezofomobenulutepiz.pdf
    • https://s3.amazonaws.com/kimone/modeling_with_sinusoidal_functions_word_problems.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_0f7b12bfc8c740f3bc3334d539a6b811.pdf?index=true
    • https://s3.amazonaws.com/feliso/16674841414.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_c34ed33a4f1f4e1988e0686b765f93ca.pdf?index=true
    • https://s3.amazonaws.com/dumupa/manual_brain_vision_analyzer.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_off0000f8d8.bin
b199a66e3dd9a6423fe60909283866c6a508dc8d17ff4b9612bb46f22f18fe62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 5580 bytes
font_01_sfnt_off00010bc4.bin
741f507a93fb3c2846596e86c93356d022398fa441d3bcc0aa95b453fe54193c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 11128 bytes

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