Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7267374fef05c0…

MALICIOUS

PDF

99.7 KB Created: 2021-02-16 03:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0030ddb18b05e4b77551368c142dd938 SHA-1: 16edfd4cb925253dc8dad1fc1ac2851341e63666 SHA-256: 4b7267374fef05c02dde310974a03e338b0fef2f844f4c2bd402a1a4e7136bfb
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to technical templates or documents, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=concave+hexagon+from+4+triangles PDF link annotation
    • http://goodik.fun/fudinuminezijopesoriwuxizgjmna.pdfIn PDF document text
    • http://dle-tpl.site/jukokadijexidukarefe3et4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fef4a4ecc185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5ff8f277273bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/UhgqgiT/kamoligafolimesawodug.pdfIn PDF document text
    • http://winoorama.site/sahnenin_dndakiler_incelemehj4fv.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/wukevirenesu/45699127377.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/lapuxaxitowikalajita.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/ieee_template_transaction.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/10601540597.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/61432357022.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/94749985587.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/sixunona.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/bukunmi_oluwasina_song_ife_okan_mi.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
    • 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_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 5416 bytes
SHA-256: 22497aa1838e4440d68145a735368c5d1c73a4921e27f44a53f64b1d3596e3d3
font_01_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16776 bytes
SHA-256: 8aaa70a7879ca02880d9567d5f3c4551813fc91ef7d1791b1b67948c255023bf
font_02_sfnt_off00016c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C33 16188 bytes
SHA-256: ef642a087c9385e9f06c7fbcf4f6768ac3f79113b889a198590308554a579c1e

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