Malicious PDF — malware analysis report

Static analysis result for SHA-256 87abd37c76a2f954…

MALICIOUS

PDF

64.3 KB Created: 2020-11-28 04:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9aa13d9acd1d75879075fefca193e63f SHA-1: e0783b8931b9658810a241272886b3669bb13f7b SHA-256: 87abd37c76a2f95478101c088d59f81704962543a63e727c68eb27662fd60627
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=bangalore+days+tamil+songs+free++starmusiq PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5faf909242143.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/4331330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f88a3f156a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fb73d4dd45fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_5f95c24109564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f9a22208972a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_5fc0b492158da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f8df23ad055c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fb4a1d56c5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fa4601e675b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ed348f-eeea-4978-b048-fba79d581665/tobidukubutimisotuxufile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d0256e-6988-4414-9f53-db17b2caaf4d/permis_piton_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215932b2-afa4-4073-855f-39d7d700e380/ap_us_history_summer_assignment_2020-21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b60020-6f4c-4951-9358-3fdabe14f14a/pink_eye_survey_crew.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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 5504 bytes
SHA-256: ab76870f1de68510e055c9dfcd65d137123d59207ba4d22b6716fa3ebff35c19
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 11496 bytes
SHA-256: 3bd3752c531019c57f2a0dde5a36394674958058c84310e7205b244d89d5efca

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