Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ffa5c80ef8fc7a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-21 11:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d8ac9aed8e0439291bdd4b8ce5a1f897 SHA-1: 19c24d37f2dffbba4982f1d4b2b512407c8003dd SHA-256: 88ffa5c80ef8fc7a8196bbec3c824612712d49034acf9f90a1c0415c57379d36
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to attract traffic. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=the+visitor+massacre+at+camp+happy+game+online PDF link annotation
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/zigel.pdfIn PDF document text
    • http://beststudent.fun/libijewugevasudup1hixz.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/3841df5090.pdfIn PDF document text
    • http://monogawuw.iblogger.org/61076647644.pdfIn PDF document text
    • http://javugejerez.22web.org/atresia_de_esofago_clasificacion.pdfIn PDF document text
    • http://zoomita.fun/480658810946u5fa.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/7452060f220421.pdfIn PDF document text
    • http://gratoramm.website/kenmore_elite_smartwash_quiet_pak_9_error_codeshlw90.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/gowupuzokowuxes/53252688790.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/ignition_scada_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/5774777404.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/adobe_full_gratis.pdfIn PDF document text
    • http://xinirujoki.epizy.com/jesilima.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/melesosogosewijumaxivuzi.pdfIn PDF document text
    • http://setowibuvi.epizy.com/appium_android_app_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/75212988526.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/wizard_citation_sewing_machine_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/72946037984.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_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 5456 bytes
SHA-256: f4bc7aca51261be6750c191d2764bb4dbd3eca1cf529fd53c7cc74d01ee4ba1c
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10148 bytes
SHA-256: 5a50f5aaec1a0504fa2f832de0c917bf5a3575ebeef0a6ef0174bf55bcb36a2f

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