Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c7915691e6088…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 23:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a5bee606b74c19c2ca0a6339b0a7de2 SHA-1: 043d4c2fda602b5d56c56c0cbc19f4232873a3d3 SHA-256: 390c7915691e608871984a93d298433d84c516f346e809e1aa14e76251a35630
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one prominent URL identified as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'certificate for guest speaker'. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=certificate+for+guest+speaker+deped PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6014c45f8a9ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fc5913c4df01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fc7cc8599f65.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/modern_hebrew_alphabet_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fec943570e13.pdfIn PDF document text
    • http://edaruzal.xyz/12283261372x07qe.pdfIn PDF document text
    • http://gedagefi.22web.org/broken_line_graph_worksheet.pdfIn PDF document text
    • http://firstreadersclub.com/understanding_viruses_teri_shors_ebooko4je2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff8d7b92270f.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/6254322298.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/who_invented_the_filament_light_bulb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_5ff4ebd731796.pdfIn PDF document text
    • http://selolaz.66ghz.com/92644973804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_603aa08dc0da7.pdfIn PDF document text
    • http://comp-arenda.site/hp_deskjet_2620_price_in_nigeria4bd5s.pdfIn PDF document text
    • http://tugajerugo.22web.org/my_bike_computer_stopped_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakupoxefale.epizy.com/pepunavo.pdfIn PDF document text
    • http://kenovog.rf.gd/96958520745.pdfIn PDF document text
    • http://fapizof.rf.gd/editable_infographic_template.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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5260 bytes
SHA-256: dcb5ac6e0b2483c3650424aa22096fd6cdb55c949bd58891bd288fda218908fb
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10168 bytes
SHA-256: da773c218dea3f2d422fa7a791ee955724165349882fd0e42072e8f313811146

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