Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4836645f35df20…

MALICIOUS

PDF

108.9 KB Created: 2021-03-16 23:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f65da4a2d1e3bd570d8b2417a1ee844f SHA-1: b6b3a7fc131c81e4baeef2c81cd1398ea7ce1f06 SHA-256: 1a4836645f35df20b64d3fdd9325ab4b9cbd0374ea08b9d4b2f1fb24369ad4ee
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure, disguised as a worksheet. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the detection suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

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://xajibur.ru/wix?keyword=nova+origins+part+2+how+life+began+worksheet PDF link annotation
    • https://cdn.sqhk.co/lomekojop/hiKgiji/afx_slot_cars_sets.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/fAjijiJ/jobagutelo.pdfIn PDF document text
    • http://biolinkus.me/vumuvexowojumosudarezaowdx7.pdfIn PDF document text
    • http://itprod.space/tenawerevopozipukejfyx4.pdfIn PDF document text
    • http://vobadixu.22web.org/didolexopifik.pdfIn PDF document text
    • http://kinoogf.space/46534653952epa3r.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/PaG6igG/account_balance_definition_audit.pdfIn PDF document text
    • http://uspeh.icu/fonabosevubixokunatiza0ese1.pdfIn PDF document text
    • http://latuha.com/bengali_letter_worksheetxkkz6.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/zabejuvijolu/inplant_training_report_format_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/aws_cloudformation_template_environment_variables.pdfIn PDF document text
    • http://wadatexutogowig.rf.gd/34083909984.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/nessun_dorma_lyrics_luciano_pavarotti.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/8574424637.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/56912753988.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/educational_psychology_review_impact.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/types_of_assessment_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/lapetati.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_off00016da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA3 5620 bytes
SHA-256: 495c1864580e789ae9b6d3d7977f61b0901a076040f05784b4d9e0fc6503653e
font_01_sfnt_off000180df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DF 11012 bytes
SHA-256: a80ee188688cd15c44ea03a70a4f07fcece1d32c5ddf4ea23d6a9c0135a23126

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