Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9668f6f1007743f…

MALICIOUS

PDF

95.5 KB Created: 2021-05-20 15:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e822addb7ea378403a74068a0fae261 SHA-1: 6dbc64d7617a86dfc19704c064b9f942897f6250 SHA-256: c9668f6f1007743f1026daad069e2987b0a7094787839846311909fe3bfae6e0
156 Risk Score

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 0.9988

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://jacksth.ru/strik?utm_term=en+la+ardiente+oscuridad+libro+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5ff9342713e6e.pdfIn PDF document text
    • https://julupoberoraw.weebly.com/uploads/1/3/4/3/134353221/pagukow-xedavus-wuniwiboxurep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_6005e5a91b699.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/695104f4ebbf.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/1948987.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/detexizeveseraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_606cca3948f69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/teximeregolexinubili.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/vavomirow.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/ashok_leyland_dost_specification.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/paint_sprayer_for_cabinets_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/best_halligan_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/57371336396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424ca188-9c10-4e02-a883-c042b4b66b82/buzovupijizafuramisi.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/hcl_technologies_annual_report_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/the_witcher_books_box_set_english.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/cruiser_bike_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283635cb-991d-473e-bcd8-852dad81bf39/illinois_trp_issuing_system.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/siruke.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/73079877880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7647fc6-ecc2-415f-a36c-638d34afd181/13470497627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0357497-ef9e-41f4-97cb-42702f5b267e/what_are_the_different_types_of_nursing_diagnosis_according_to_nanda-i_select_all_that_apply.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/38070240476.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/87473269321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 5128 bytes
SHA-256: 78c9a1f70f8d1762d1e4f6cf5596b28c5c06b0eb38437d4130899eab77e93dda
font_01_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 12756 bytes
SHA-256: 13a6fd2c49e4651b3ceb14458299b291a3ce137979635dd0c9ce8e4b09bd5c5e
font_02_sfnt_off0001627e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333