Malicious PDF — malware analysis report

Static analysis result for SHA-256 93de827d18ca3613…

MALICIOUS

PDF

79.2 KB Created: 2021-04-22 06:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7de557d016ef11a47f0406159be0252e SHA-1: ca67daac0a0f83631e4332177d4b8a98cb2b6b49 SHA-256: 93de827d18ca361396be2559d82648fa3e2b431ec90e2b434fb0fa606529e717
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://jottigo.ru/strik?utm_term=artemis+fowl+trailer+subtitulado', appears to be an SEO redirector. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=artemis+fowl+trailer+subtitulado PDF link annotation
    • http://vuroxinizona.scienceontheweb.net/charles_dickens_barnaby_rudge.pdfIn PDF document text
    • http://nelodagavezes.mygamesonline.org/pepexudavo.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/bogatezijujuvoboxokopet.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/adobe_premiere_pro_tutorial_free_download.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/bushnell_neo_ghost_bag_clip.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/assessment_and_evaluation.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/imam_al_ghazali_livres.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/8199084117.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/zemunomipazikez/attendance_list_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f9e2b4-3d0f-4c47-8b90-6545c183e51a/89064802280.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/english_vocabulary_list_with_meaning.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/nugalopitefisir.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/lakakufikezenazikepatut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e303ef4-e85d-4631-8aff-b9b366033157/zakixomakokukor.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_c0d9d1175feb422cbb4b10b52e72e01b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/57420338113.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/medirid.pdfIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_6a60bbdf2f944c35aac99ea971e389ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a542e1-02e3-416a-a296-226f77e5639e/97454416211.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/kulekutijulupobusudaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29efa7c6-fb97-47ed-8b7a-d46a52d16084/online_restaurant_booking_system_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/excel_macro_worksheet_cell_value.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_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 5272 bytes
SHA-256: d73e4d74798a772c6ad251812ceba1091ccd737cb7df3b75ccc2d1119b3e1c2d
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 12240 bytes
SHA-256: 9d6a0fc02f8b5dc201f61fd999019e0c4163d37d8c656f5420d573901342f58c