Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c835c885fdfb9ce…

MALICIOUS

PDF

177.4 KB Created: 2021-04-02 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4f9613c0b71d4fd261de9643041118 SHA-1: 976e4d283cfa23c4472c5edc3b0c83c5c56036c5 SHA-256: 1c835c885fdfb9ce2ce050b7a8718381949f4420d9ffc5aa2a147a532b6ceb99
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that masquerades as a school-related social media link, likely intended to trick users into visiting a malicious site. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://dafemum.ru/wix?keyword=hillsville+elementary+school+facebook
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/9066910.pdf
    • http://xikibokukubis.iblogger.org/narrative_of_the_life_of_frederick_douglass_audiobook_chapter_3.pdf
    • https://xopadubimedo.weebly.com/uploads/1/3/4/8/134858850/xerogor-janiwu-fejot.pdf
    • https://sawasorepe.weebly.com/uploads/1/3/0/7/130739445/6566826.pdf
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/e3be7.pdf
    • http://winokuzovew.iblogger.org/approach_to_myopathy.pdf
    • http://juxumigine.mypressonline.com/cavatina_partitura_guitar.pdf
    • http://vazagitomis.mypressonline.com/participle_adjectives_grammar.pdf
    • http://xidasetetobuge.scienceontheweb.net/85455786581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sipanokule.onlinewebshop.net/wurosimemapi.pdf
    • https://s3.amazonaws.com/lomuper/adjustable_infrared_sensor_switch_datasheet.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_f37f631967d5449a92909593861cdca8.pdf?index=true
    • http://tarepos.onlinewebshop.net/16111148962.pdf
    • http://volenivojox.epizy.com/miwosixuxa.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_e8e27cacce55471da09f5ac336cd7a87.pdf?index=true
    • http://garapaf.epizy.com/tadigiwaradepedejufimu.pdf
    • https://uploads.strikinglycdn.com/files/6c50aab6-2b68-4532-b435-4622d9a628da/29862445128.pdf
    • https://uploads.strikinglycdn.com/files/7504382c-a1fb-4142-9a0c-a1730674b7c2/talaxapepisizadunusupa.pdf
    • https://s3.amazonaws.com/regovadeje/nukiferusidimajo.pdf
    • https://s3.amazonaws.com/rotowan/57868191675.pdf
    • https://s3.amazonaws.com/dowesitobuga/rifatasajuvolil.pdf
    • http://mijikabetabup.rf.gd/labanupotebivavu.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_off00027f79.bin
d1160d4acf384d508cd95df1ae9911601146c612926e992b0d71b74565c20582
pdf-font-stream PDF embedded font (sfnt) at offset 0x27F79 5448 bytes
font_01_sfnt_off000291e4.bin
f5750794b903a40ff2eceaf54f43aa0319148462ec82163a9aa7a09cec1fd6e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x291E4 11116 bytes