Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddb774fde9ae533…

MALICIOUS

PDF

81.7 KB Created: 2021-05-19 06:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a978efc1f7904357315c5b0da15a3c6b SHA-1: 4fd83c1d522075545de0b33127d4af6d6a32d20e SHA-256: 9ddb774fde9ae5338b3d0c4327c50014f175363e50a98bdff8e6691adfa7843d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://pelibifir.ru/strik?utm_term=books+of+nicholas+sparks+list PDF link annotation
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/gefom-sasataxuzel-nodalubemadeji.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/lovowela_jamedor.pdfIn PDF document text
    • http://sijowusim.22web.org/estenosis_acueducto_de_silvio.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/jufinif_zazupakip.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/kozofotopigaludef.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/fadfd2cb8.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/6563262.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/515d9a482f.pdfIn PDF document text
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/wofeniwud.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/wuzalugiseto/brawl_stars_apk_indir_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/what_is_coding_with_python.pdfIn PDF document text
    • http://todezisalofabit.rf.gd/central_limit_theorem_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6674d095-6b65-4bfb-8da3-7a3815743417/purivotuwofada.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/34926656340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292c57f6-e193-4662-8853-a7b68373a9a2/dbx_166xs_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fb4cc8-edc6-4c1e-8117-897402c231f2/kirogalutomawepo.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/verizon_samsung_network_extender_scs-2u01_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/rumuxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038a3cfa-8b66-4ae0-9d8f-6af17cdb765c/87221704021.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/livijamawezub.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/zawisozikosekuxubebis.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/button_click_animation_in_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13749f0d-9baa-42df-b846-bb586258c175/emerson_32_lcd_tv_lc320em2.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/77028303402.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_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 5216 bytes
SHA-256: da0b2f92a81c7fa9a9ad493a34dca76bc5c73626e1ec2435f8a32b9f3310c011
font_01_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 11216 bytes
SHA-256: b33c162a82090bb92e0c1d23ed8be28b085833c0441494f1b759e1c6eacf0016

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