Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5999dd3e82fc03a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 04:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ea345ed9020c5fe737ed6894073f3473 SHA-1: aeeb271590545d9d687ef3bfa0b6b984614cc391 SHA-256: c5999dd3e82fc03a5cad2d74f6ab89f0cf7292000764bb8df09e412cbe6b6024
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL points to a domain that is likely used for malicious redirection or hosting. Although no scripts were explicitly extracted, the nature of the PDF and the presence of an external URL suggest an attempt to trick the user into visiting a malicious site, likely for phishing or malware delivery.

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://jacksth.ru/wix?keyword=mole+relationships+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459468/normal_5fda93c880584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fdb8d13546c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_600fd6d162542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5fdf632d854b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcad84076f0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fccdf5a2cd06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60253dd182218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_6029e86772632.pdfIn PDF document text
    • http://socialwave.me/vowiradebadubesutawaroklcg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/galacticraft_extra_planets_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/bubabonegezodubudegopivek.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/wepikadasezegotu.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/zogifelifogelefu.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/punctuation_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/javax._activation_1._1_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/83936580774.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/71231294747.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/reported_speech_reporting_verbs_exercises_online.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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 5068 bytes
SHA-256: 04df68e9f7bb40741d111c1cb1f78042f159f40e00ba4e4d6e592c99ae66c97c
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10608 bytes
SHA-256: 6aba876c06d88231b42e4793074aa74e908ec67c6c7f2cce69afec087e1a6a89

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