Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8c8470b7459f84…

MALICIOUS

PDF

128.6 KB Created: 2021-04-05 19:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 47d89a6e3bbfcdde6b121cbdd27098d6 SHA-1: ae72d1af80d35b2daa3993c3aebfed892c17ee97 SHA-256: 0a8c8470b7459f84a8a1541a14098778f3440a68900ffbfff88e0149d9ccae02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external links, including one to 'maypoin.ru', which likely serves as a lure or redirect to malicious content. The document's structure and the presence of many external links suggest an attempt to manipulate search engine results or direct users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=doki+doki+literature+club+act+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455681/normal_5fefb145bc44d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417519/normal_5fef7aae4c633.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/xij3gfT/mi_notification_ringtone_download_mp3.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/353840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60500846e76b8.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/hgDjbkE/fodokevipazaguv.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/xixafofutakire.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/CkDicAs/tebunepul.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/jEehjF1/hidden_valley_road_book_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5ff5de9507252.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://uploads.strikinglycdn.com/files/236d7abf-3e02-4f7a-a52c-a52cc2ca11b5/57338562711.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_b8332718199041ad92ca959997d04888.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_c0579b4586714eea80c08424575e5fab.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_74290dc79b0c4493bb4cd679a6a89cdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3114b7c0-c638-4089-b416-2c4570e1efe4/dinamicas_de_presentacion_en_linea_para_adolescentes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b5205c-72b7-458a-9bc2-1de5a76e520e/41990361814.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_872cd8e1841b47ec8e875001eb8115cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/852688bc-84d9-48fa-bdf3-f47b1344825e/maxi_dress_for_daytime_wedding_in_pakistan.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_064c60200f32443ea41eaff87cfc79dd.pdf?index=trueIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_57309cf50afb4c4c8aa10745281f671d.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_5ed6716406404581a4008cfb709ceee7.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_822ae96096cb4468a35b9e710b680389.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_79d70e47e1f24a68b7f960f588a99cd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d31bcbc-72b1-4a9f-be1f-4c574cce9cf0/pafadozumom.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_off0001abb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB0 4900 bytes
SHA-256: 890f9017fa49d994cd2cf5e3e6fec1d3889d5a3744f942d66e709c3b4b23c3dd
font_01_sfnt_off0001bc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC6A 13072 bytes
SHA-256: 88bb58c2fadbc31da06a62225db4962de53a7bd003b3877ec447c9a19a611658
font_02_sfnt_off0001e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E667 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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