Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeca578eef107a21…

MALICIOUS

PDF

71.4 KB Created: 2021-04-05 08:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9246144a2df25336f2b898c716f1dbc2 SHA-1: 84da8b2ad32d5f770806a5fbbe69e39d50eb3552 SHA-256: aeca578eef107a2112860161f36135b2ceef5701e464f523329d49844d02eec1
186 Risk Score

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=mathematics+syllabus+for+primary+school+in+ghana+pdf PDF link annotation
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/zesoges-fewijebekude.pdfIn PDF document text
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/0f1f8cd55bea.pdfIn PDF document text
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/1d33f4.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/5835855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_600b4de6bbdd0.pdfIn PDF document text
    • https://zosolino.weebly.com/uploads/1/3/4/6/134676828/5416925.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/sozudukomopipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fed80dbd8e27.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/b6296526a33d0.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/2312606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_60000d097d20f.pdfIn PDF document text
    • https://pejeronasoko.weebly.com/uploads/1/3/2/6/132682646/188ef767752af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600b6a5f2be83.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/b195003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_60399ff33b5d9.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/023d34e641.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/71d71ef5f10.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/jusagi/ocean_of_apk_call_of_duty.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/33241110312.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_f9f997ff9e764abca0a206184b3ae91c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/android_9._0_pie_features.pdfIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_404d9d606d5d4ab8ab55cf2a53108d97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/letra_del_poder_de_la_oracion.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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 5816 bytes
SHA-256: f7aff0c000b3c04493b6e5b5f2af89fa97291f629ee43bfd302c930276427bb5
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10468 bytes
SHA-256: db1c4a3784a310ef05bf13186628e48e3562601f1e600e8ef0d37a1456cc647e