Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dc84583161fe7b…

MALICIOUS

PDF

63.4 KB Created: 2020-12-16 02:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ad108b155f84e0746f5baf84bdc0cd4 SHA-1: 97a858af90c289ff5db11b6d0ea9a464e765c3f6 SHA-256: 83dc84583161fe7b4767dc6849e99ed9b925d51e0c0d4115d82d243431c42c21
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 directs users to a suspicious domain, likely for credential harvesting or malware distribution. No scripts were extracted, but the presence of the malicious URL and the overall detection profile strongly suggest a phishing 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://traffnew.ru/123?utm_term=subject+and+verb+worksheets+for+grade+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493549/normal_5fba95d04aacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5f968ba0a37f7.pdfIn 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/d506b3f3-ddd7-4182-8cfa-8f6b65673f5a/folaniroxusunos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f630c4e-d296-49c8-90af-ba08a586f8d0/woods_pocket_multimeter_dmmw3_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78deb5c272238a81acf84/t/5fcd36b8d235d37878d0d70a/1607284408338/loseliwefudazekubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2e8469-121e-4b28-99c4-0da6ce09ec3e/gigabyte_ax370_gaming_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cd7ee3-090d-4500-9dab-ade43cd526e0/self-reference_effect_example.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/jijorifapadob.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/27915363018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c517953-ceb9-4623-9d40-999f9ebc05b6/jolowevinonidujusexov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea52862f-3cd3-4bb8-8ea4-be9ba2ee3dde/fugoxefevude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccc3741-197e-49d4-8fa6-da1cc5b96da2/bazeranav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1611e0cb-359a-4d73-9042-d18b48548cc2/barbie_and_puppy_adventure_full_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d2b654-b317-458f-98f0-6de31c7572b4/zikubisuvux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d7172a-c100-4c9f-b030-f59147af936c/52250729186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa29d56-2bc0-4529-b322-385b4875dadd/donjoy_playmaker_knee_brace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe11006-1bb6-48a4-b579-efdd084cdfba/tangent_secant_theorem_khan_academy.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_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 5840 bytes
SHA-256: e90c22a0142d8b3c5823bcbcb3335f52e8454a28857a6640d2ac413e00ead86f
font_01_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 10184 bytes
SHA-256: aba9816f4e586ff6de15cd4544d1e26109c7ec230c0a5d5bcaa4bfb7b936b67e