Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec13ae4e3a0a724e…

MALICIOUS

PDF

83.4 KB Created: 2021-05-08 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bba501eb847764fbeb183a6b715e38d4 SHA-1: 0866ac3e95f9b4ce7da9b65867620012ed76a810 SHA-256: ec13ae4e3a0a724ed87cac7b5df57ab943ecabc367dde62350d7637c45e4175f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a URL with 'utm_term' suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=15+day+weather+forecast+kauai+hawaii PDF link annotation
    • https://cdn.sqhk.co/sikozejaxed/yifvicZ/rotizuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/jfyrmid/between_the_lines_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/DhdieQQ/simpson_racing_gear_bag.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/gifiiWC/78710085511.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/XhflLLc/rayman_fiesta_run_android_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/gdbwdNU/selomakoterid.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/1559982.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/zedisinivimux.pdfIn PDF document text
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/jenojetubetope-mokibupanufogo-fetozizib.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/xg0mhjJ/73709923788.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/FgeLugf/pizolowabafaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/eggkggs/classroom_management_theories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoluriwibifezoz.rf.gd/vemid.pdfIn PDF document text
    • http://soreras.epizy.com/68607944390.pdfIn PDF document text
    • http://mebusojuf.rf.gd/jelajiwitijujuxogexa.pdfIn PDF document text
    • http://zoguwazor.epizy.com/22658299977.pdfIn PDF document text
    • http://tajijubu.rf.gd/bissell_powersteamer_pro_deluxe_manual_8804.pdfIn PDF document text
    • http://medelomozukomav.epizy.com/how_s_it_going_answer.pdfIn PDF document text
    • http://midowuvebadol.rf.gd/wiladazonezedisezo.pdfIn PDF document text
    • http://vudamup.rf.gd/how_to_change_camera_resolution_on_iphone_7.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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 5416 bytes
SHA-256: 106ff9dca6be2d88969a2de1be55191228421fb5ae1eb557306579feebc520a7
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 11452 bytes
SHA-256: 6800f625d865aa396922a0fa892942e61b27e05b904d992134aee3542f8de6e4

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