Malicious PDF — malware analysis report

Static analysis result for SHA-256 915d7a3bb7acca79…

MALICIOUS

PDF

84.7 KB Created: 2021-04-03 10:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ab1174152adef943dcdfebc6aa8c88 SHA-1: bc80dd147055d7c3326612e93925ff185ac2f67c SHA-256: 915d7a3bb7acca79eea00c6fc207c6a379671f6be90af037b41d64ac57d29989
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains commonly used for SEO link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=rewrite+sentences+exercises+advanced+pdf
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdf
    • https://cdn.sqhk.co/foluxaziwaj/hjdgdje/matrix_bullet_time_sound_effect.pdf
    • https://cdn.sqhk.co/boguzivipel/sDidS50/kejavujudizokud.pdf
    • https://cdn.sqhk.co/pozazoji/gdgcjiD/90033320642.pdf
    • http://dujoxizuzepofom.iblogger.org/lokixexos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d0dadb3-20f3-451c-8d10-c4b052c86a6a/georgia_driving_license_check_ga.pdf
    • https://uploads.strikinglycdn.com/files/6861861d-8a76-470b-a558-a484ac13409c/arrl_handbook_2020_table_of_contents.pdf
    • https://uploads.strikinglycdn.com/files/7b9530eb-925f-4fee-8156-73c253bc8540/51406982317.pdf
    • https://uploads.strikinglycdn.com/files/c46353c3-9f03-43a8-bbc9-9fc748b3b105/59880532763.pdf
    • http://pofiwun.rf.gd/99103586931.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_6aa7928c7e89483a8719b70e8e239e72.pdf?index=true
    • http://wekivegu.rf.gd/aua_haematuria_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/1eccd5d8-55fa-4629-846a-61eeed9c4863/macbeth_act_2_key_quotes_analysis.pdf
    • http://vojemigami.rf.gd/33256214981.pdf
    • https://uploads.strikinglycdn.com/files/5eaaa38f-6ffe-4ac2-9d1a-5f7ff5837204/45975789261.pdf
    • https://uploads.strikinglycdn.com/files/7885a15c-21fb-4c88-946d-d077cd0ab335/17500126923.pdf
    • http://kafupepizaji.epizy.com/lowest_calorie_food_indian_takeaway.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_b225fa4fce304895b867a00233ba9958.pdf?index=true
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_6874fe807c79491698a4e196a9ffcb76.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_0c461a8724d54f86909b602dfe0a0637.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1fa3582-c7d2-41e0-9f3b-707ed21f066f/fudasupotaxixakuvodugiwe.pdf
    • https://uploads.strikinglycdn.com/files/c3ab7cab-9d07-44cd-9c85-bccd5c795cdb/what_is_the_best_samsung_galaxy_tablet_charger.pdf
    • https://uploads.strikinglycdn.com/files/e895eeea-27fd-4c7b-a65e-819fa622f66a/metoxilo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab5.bin
57e6e87f6c062a73ac6b56cb2ea48133e172123b2aca13d179ce39bf256a4c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 5344 bytes
font_01_sfnt_off00011d15.bin
da96421eadc874f363ca047be2458efd1749d5b42423e227439396107a1767a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 13052 bytes

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