Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d224fc5fd6774f…

MALICIOUS

PDF

76.5 KB Created: 2020-11-25 20:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f7fa155dd90e105b0c9f7b4b7d7fa100 SHA-1: 7ccc46ca5e5fe764f893ce760852d6afede22949 SHA-256: 21d224fc5fd6774fd58a35775fa8971205ba32ed70a39b82ff1540303759fd37
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that points to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'Spanish answer key', likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=conjuguemos+spanish+answer+key PDF link annotation
    • https://nufivoba.weebly.com/uploads/1/3/4/0/134017608/1630b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f94cfd6bd0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5fad8285b0de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fbbc008ae43d.pdfIn PDF document text
    • https://sazukigozozabep.weebly.com/uploads/1/3/4/3/134310948/9167876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f991b5b3f961.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3535c2e4-038a-4ed3-b43c-06799cc273f4/96976872231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24922b38-4fc5-44ef-b089-f9d61d9a542a/82532370333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a340c4-93c7-4d7f-86b2-acf1c67e19bd/83498723725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2437ef-db2f-4062-9b14-3c1ba90767c0/sewog.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/bmi_vietnam_pharmaceuticals_healthcare_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4595ef2f-0e83-435b-8f4f-c89a00a133c4/queen_snapper_fish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926a8be2-6e48-4063-9621-de0910481bc4/18573378861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b467e9d-5c71-4570-b56f-7b5f0c998fa9/five_nights_at_freddys_2_custom_night.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d672.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD672 14684 bytes
SHA-256: 664e125bf15333623204dc121cec98f7e06dd5ddaa5fad2b6ea7ff8a2abdfe63
font_00_sfnt_off0000c40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40F 5440 bytes
SHA-256: 665a6dbd0aa7cb1036268098fd32dbb10bead91c5f030b05f577abe9fe06de46
font_02_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 11136 bytes
SHA-256: 3b3525e6195bd6c7bc373e42259aeac9b6795f782b1a0e7be58611f3a484632d

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