Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae2f54bbcd297b5…

MALICIOUS

PDF

66.6 KB Created: 2021-02-21 03:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 20506c703af2e2ab80d1d63a6e474469 SHA-1: 507cf38ac3325a0456a0b7e873964fc9bf9c5601 SHA-256: 7ae2f54bbcd297b5b9cd6278334c728e214c276d6a98da6cd478c9952909bc40
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a pattern of redirecting users to potentially harmful content.

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://crophysi.ru/strik?utm_term=feminist+literary+theory+google+books PDF link annotation
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/jinesuwugosoji-tekedakalud-pofikowusejunep-wabisa.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/xelibawalole-dejizogab.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/saladetimomudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_6012334836140.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/fiwukuxemozazapuvowu.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/dosigitalaji-jezurajax-rowade-narakife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601132075fb14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5ff2578abac40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60315781209c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_5ff9918e3f872.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/wabufejinulanezin.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/f44d896d2994.pdfIn PDF document text
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/f3ab7847dcb9.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/bosuxikisuwi_tupufedukolet.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/4106829.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/dejolavubukugeb/46321716443.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/zoxodomamuvinamu.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/wowupoginusexixomidulizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/python_bottle_template_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/97449737305.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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 5360 bytes
SHA-256: add543c6a8187f9aa214ca288592b45a25a7e60586f0b9bcdda69fc4e9c34406
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 9764 bytes
SHA-256: 0b3f00b8fb0917f6785dc0e10bf927e6802ffa1beb9365e525312720fa61a551

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