Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb75fd0e4438e8…

MALICIOUS

PDF

77.8 KB Created: 2021-02-18 06:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f38f44c290487a9601ab69ebc3bd562b SHA-1: d9c6ca2062dd5feed36383e721c49ecd12997210 SHA-256: 61cb75fd0e4438e8e003d8fea1ec7a9018a8c733dfb3f346916d7e07135bf8ee
156 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 0.9996

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://maypoin.ru/123?utm_term=naming+molecular+compounds+worksheet+answers PDF link annotation
    • http://idealslimitalia-ufficiale.site/fimabagakabuwesijedezi1zjaq.pdfIn PDF document text
    • http://astrology-personal.online/ejercicios_de_geografia_sexto_gradoefnhg.pdfIn PDF document text
    • http://robinmani.site/whatsapp_messenger_for_blackberry_boldrj54e.pdfIn PDF document text
    • https://denafeferigo.weebly.com/uploads/1/3/0/8/130874231/1263122.pdfIn PDF document text
    • http://card2card-perevod24.site/new_vermeer_bc1000xl_for_saledrug5.pdfIn PDF document text
    • http://triple-doska5.club/616677464969qmxz.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/268348e8f30ac5.pdfIn PDF document text
    • http://eagleaff.com/equilateral_triangle_finding_area_worksheetskdrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_602d6eb74dec1.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/8122903.pdfIn PDF document text
    • http://nikecortez.net/40904995798vr09n.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/sagiwuwugawal.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/mizeteb/the_chainsmokers_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/93568808508.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/popetakozewizi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/pantheon_guide_rework.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/arduino_mega_pinout_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/noxezuw.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/66212889559.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/19480877936.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/brand_equity_questionnaire.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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5612 bytes
SHA-256: 3d541843d436ad8a22c79ed884b9cfb3eb7ba8d2f47d968eb0d410ec929adffe
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 10316 bytes
SHA-256: 71bb5e9a16db8e3e6c424ad625d973ff413580b452546543f86a15b26df2c17b

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