Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cf669e16314790…

MALICIOUS

PDF

84.1 KB Created: 2021-03-09 06:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a52d904403bcf22354dce5789a1434e9 SHA-1: 4b79814b8512fb4dc51c493515a7a7f76ce5342d SHA-256: 41cf669e16314790301d18c92291183e28c801c6b64aa399b69b4e88aa442631
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, indicating it is part of a link farm designed to drive traffic to various websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=suddenly+seymour+piano+pdf PDF link annotation
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/6e72f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_602ef6166995a.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/4812049.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/8bfd0.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/pulse_oximeter_manual.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/jitukita_befafudupega.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/d57c7391b05.pdfIn PDF document text
    • https://foravidamekog.weebly.com/uploads/1/3/2/3/132303307/mewij_renukevuluzuw_feximatonuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_603271845cc95.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/rifukofekunileruxipitopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5ff458a33e5bd.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/6705513.pdfIn PDF document text
    • https://sofovelo.weebly.com/uploads/1/3/1/3/131379060/sibetorasebopofa.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/how_to_make_your_boyfriend_a_gentleman.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/varizojekagoberiwogofuju.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/excel_vba_for_each_two_dimensional_array.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/c8c37f09.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/5099043.pdfIn PDF document text
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/93827e71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_9f2ebe5b6155461abd78abdbf5a285f4.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_aeeb4325054c4d03b345ae96662e2daf.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5392 bytes
SHA-256: 78e7f611b4c7564efdef148046441407b193f7198b378175eb24f4bd924a3f1a
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16436 bytes
SHA-256: c8d288973ec17b1822f7a369f05ab6a0c175272796f4e0381ceca8ecbc5915ee
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf