Malicious PDF — malware analysis report

Static analysis result for SHA-256 722374dcc13f94bf…

MALICIOUS

PDF

81.3 KB Created: 2021-04-05 17:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57c0a939c1b7385b465388ba983109b0 SHA-1: 5a84c0ea0e7a67dc4a6bf19ab0bcbd7419629a7f SHA-256: 722374dcc13f94bf9f4ea7ffc4b2bb27c903d21073deb22d741f49c329730de7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://xajibur.ru/strik?utm_term=mayan+numbers+1+to+1000 PDF link annotation
    • https://cdn.sqhk.co/sesexibanobu/5idAvgf/64327832504.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/2ggjjVk/ghost_riders_in_the_sky.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/cfpJkhi/53306537905.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/i7heagg/vlogger_go_viral_online_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5fee9c0c7a0c9.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/best_android_tv_box_canada_kijiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_606358750d199.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/hhazTfN/corn_maze_2019_rochester_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/hdajip2/27831929805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_60174112439cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_600bd19648dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_6035c8662baba.pdfIn PDF document text
    • http://pubolovuwete.iblogger.org/42742865889.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/hvCU1VI/29812146094.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_1f2fc5ba906640cab4f7220a24a43915.pdf?index=trueIn PDF document text
    • http://mutexuwe.epizy.com/music_video_treatment_template_free.pdfIn PDF document text
    • http://xutunivukus.rf.gd/97112562375.pdfIn PDF document text
    • http://tezotidugo.epizy.com/fobamosojunafedujunupamax.pdfIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_29a550091798415da6934388841ebe9b.pdf?index=trueIn PDF document text
    • http://mogazijanadoro.rf.gd/41059020582.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/2020_lippincott_pocket_drug_guide_for_nurses_free_download.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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5240 bytes
SHA-256: 35ce1a94f532080194e531f4b09f5ea0086e422c25d58dda60737dba4997b98e
font_01_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 11096 bytes
SHA-256: 17738abe4d66be6a0a4ce4d0deccefd6ad5866d3e26b74c79211ca006414f841

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