Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb8f421b6d32bc5…

MALICIOUS

PDF

69.3 KB Created: 2020-11-19 09:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4eeda99946337e3cfb58f715c2ece072 SHA-1: d21bd6c72d170da9d1c747821d5de2f7ed9b7d52 SHA-256: fbb8f421b6d32bc580eb2f73dc787ea9c483e8b7e3cf9e5b9b6f5b43be1fd1da
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=sunnyside+high+school+logo'. Another critical heuristic flags it as a PDF link farm, with a high number of external links, including 'https://s3.amazonaws.com/nitatotol/xowilo.pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', indicating a phishing and trojan payload. The ML classifier strongly supports its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=sunnyside+high+school+logo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5faf46d0d470e.pdfIn PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/e78a9a19.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/dobar_kawavasudazi_ruviwevitagedum.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/nitatotol/xowilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bb1c55-03fe-48e1-855f-0239dd326dd6/59041091568.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/geronixilapafagolenike.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/boravupuromewu.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/associated_cut_flowers.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/carnatic_music_notes_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/ginotijowixe.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/16745665313.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/buperi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/warhammer_40k_codex_russian.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/certificado_medico_secretaria_de_salud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2ca25f-7e82-4a2a-ac58-f0c192c69e0e/45977589034.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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 5100 bytes
SHA-256: f9b28ea8ed9ad8680c87eaa70b9371f2d5764d42aab004904e8917219a9e92b1
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10384 bytes
SHA-256: c9955def9db438d4b728b9b176a9ae6307c12450617033c19651dde38da75ce2

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