Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3d95fc33bcbdd…

MALICIOUS

PDF

155.0 KB Created: 2021-03-31 23:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 859ff67f51be08f0ece7d38f2d08f9d3 SHA-1: dea8ac0a7eb6f88011f486335ad0c0978aa8d705 SHA-256: a5e3d95fc33bcbdd09d7183f3b0a90f899fbf4fc5a6adb5cd02a6d9ccce3f47c
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. One such URL, 'https://midufefew.ru/award?keyword=biography+of+rabindranath+tagore+pdf+download', is embedded within the document, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=biography+of+rabindranath+tagore+pdf+download PDF link annotation
    • http://kuzososo.mygamesonline.org/b._d_singh_biotechnology_book_download.pdfIn PDF document text
    • http://segway-wheelchair.ru/86250963441t2rkh.pdfIn PDF document text
    • http://zoompol.xyz/tozelafemerizipisoto9rit5.pdfIn PDF document text
    • http://bigtittybella.com/baneblade_rules_7th_editionwtxk5.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/22561994835.pdfIn PDF document text
    • http://sotarebesowula.medianewsonline.com/vepifopujanisabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_9ad59e7e2e5148008b84fbd9555379f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb17979-72d9-4e27-ac32-8bac697f1d93/61693549547.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_d492815c3d4b4235a388be9961c8f46c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/832cdd47-40d9-43e6-844c-538a84313c7f/51090175795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e986fca4-8cdd-428b-8eca-128aba1e28e5/kutenabukakenopumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6173101c-2e87-4f89-9f39-83d14c9f28ff/what_fruit_can_you_eat_on_exante_diet.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_189013486e894c73b0da549e13829311.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5172ab0-3c33-4a3a-a879-288568ae8c77/86586875123.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_bd476044c419490ca836a8bbe9448412.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_9ed2aed40aca403598b009e4ea1eb301.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/574a00d6-920a-4197-90ec-324df26bcd87/86733721148.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_409e63e523654b2782478664a2649c46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12dfbea-3fb1-45a8-ab1b-b133c3be9de5/54891228055.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_5ef52f7e691747caa8c8f66c84bfd227.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_d25c3b78bdf44e6eb22e494945b54eaa.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_566b4e6b49424a13b45d06427c3ea17b.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA8C 5508 bytes
SHA-256: 2ae99c188b1e2abda662789bca5d0d534fbe47880521d4a8cb06bb4b587de6d9
font_01_sfnt_off00020d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D58 11556 bytes
SHA-256: 2a9f84ebe21162ef49d489cebb271dc6ed4d97d839748e3955ebbaa1c4a3ba44
font_02_sfnt_off0002316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2316F 14900 bytes
SHA-256: 3569aa4fbe0eceb033c6976315fc3ed1b735824daf3ab9f17f0810b1c5bce83e

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