Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1718a7521ebee7a…

MALICIOUS

PDF

87.1 KB Created: 2021-03-19 07:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cea4c54ef6dc99e61d898c19b404bcc SHA-1: 7f17c0040ea092e6e5716fc114db8b6d59fcc656 SHA-256: f1718a7521ebee7a8317141c34d29438b87ab4a4cc955f87e802e6eefa9ba48e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is indicative of a link farm or SEO manipulation. One of the embedded URLs, 'https://jottigo.ru/wix?keyword=hyper+heroes+cheat+codes', suggests a lure related to game cheats. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=hyper+heroes+cheat+codes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403954/normal_5ffa79b819e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fff83afca992.pdfIn PDF document text
    • http://bilkaita.space/nanujele223fv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fc8f0795659b.pdfIn PDF document text
    • http://zowomojagobipur.iblogger.org/ms_sql_server_free_download.pdfIn PDF document text
    • http://xekilekugud.iblogger.org/formalist_analysis_of_the_necklace.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/60516164830.pdfIn PDF document text
    • http://pavedewono.iblogger.org/work_quality_performance_review_comments.pdfIn PDF document text
    • http://madewithsunshine.com/causas_y_consecuencias_de_la_reforma27zku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fccf57d6cd3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidimusi.rf.gd/monster_vape_labs_liquid.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_017845a31993499cb38eed485d923a95.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_6ecfdb6a0ef349eb85898e3c8da9f898.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/fundamentals_of_pathology_by_husain_a_sattar_pathoma_2017_paperback__videos.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_8de13c728d144f6490da96daaa930181.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_906199f350924191a86a3a603a08ea45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowonovege/boukenger_episode_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/75255659166.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_d69780c625df40369311f77ca4d0c7de.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_177cccd09aec4118a7bfc496f4347fb5.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_9d06f8b101bb4e62857c724506379716.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_3222a350dbb14692a9a973897b4be5b0.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_b4188330db0c436fb019597cc5fb04b5.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_00225a06a12b4eaa9216ad0732855489.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000124fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124FD 23496 bytes
SHA-256: 232ff1af08515bf84789d86cc4e63f9d97bb6cbe0f2a0ee6d607d1499b740868
font_00_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5192 bytes
SHA-256: fe1b9584903ab3df7f02796f50288b0a42858759f1e26f99d8ecf6ba4f8a852b
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 11248 bytes
SHA-256: 4d4851dedb0b564439ec848dbb30e817d47c6d08dea59b6c7de8f0ee4dd97109