Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eab4ceed2483ae…

MALICIOUS

PDF

82.7 KB Created: 2020-11-18 12:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5c5a44129b773a8b60800ebe7a2062b8 SHA-1: ddb5658d792ae70c3a634bee0121e61158e7f913 SHA-256: d0eab4ceed2483aebfdde63be25ad9a54cb1a1e88231db3db261da91b7ab474f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=charlotte+middle+school+winter+dance+2020 PDF link annotation
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/3ac78b13b13.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/9093369.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/geditibuni.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/b2f95fa901f2f.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/polizaxiwuka.pdfIn PDF document text
    • https://pasosawa.weebly.com/uploads/1/3/4/7/134737133/xujawe.pdfIn PDF document text
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/wepevovi_fugidupukuzusut_navolewipo_fovoliduku.pdfIn PDF document text
    • https://surebexu.weebly.com/uploads/1/3/4/4/134458457/xuforekevegiretu.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/donarepemi/tonutazaratesuzanujutip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0279bd9c-e547-47fc-afd5-33f02fdf1dc2/tutolejuxutagelizokenojo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/razor_dirt_quad_battery_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/speak_now_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da4559e-40af-4c25-8587-301007e77a60/57739936949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93ce20d-ce07-481e-803f-e110eb3f9bc6/wirefuzinipawivejiwiwe.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5452 bytes
SHA-256: 46dd807c3b5521afebe573c7dd25c8062104840b6bb6d2613c5f8411d81c7110
font_01_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 11292 bytes
SHA-256: 72a9033aa41b6d4e75e869f926134e783fdf430cad3193b1576967feb2531e27

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