Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec2c4515d1cd7b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 09:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f9b6aeab5cf24bd613b56120e48da1db SHA-1: ae681cf31bf016faca179dcf90e051bdb7ae8a84 SHA-256: a3ec2c4515d1cd7b919c3e4a608547902928c44a1edd0755c73cc4cdac131e5b
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the link farm suggests it is intended to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=bokator+techniques+pdf PDF link annotation
    • http://watenaz.iblogger.org/aashiqui_video_songs_hd_1080p_free.pdfIn PDF document text
    • https://mazidumusud.weebly.com/uploads/1/3/4/6/134680178/1aff37dda.pdfIn PDF document text
    • http://jufobimagif.iblogger.org/liketumilokeramokadik.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/1622561.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/zeduxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_f8775794fe5d46af9795c9b05b93d253.pdf?index=trueIn PDF document text
    • http://laribemexomog.rf.gd/35129848120.pdfIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_a4e7e4595660463bbb01baf6255e41df.pdf?index=trueIn PDF document text
    • http://baxudamotis.rf.gd/perform_routine_electrocardiogram_ecg_procedures.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_2089d37f340347d4bcd6192b5008bd1f.pdf?index=trueIn PDF document text
    • http://sowarom.rf.gd/astm_bolt_torque_chart.pdfIn PDF document text
    • http://kobelitorapojop.rf.gd/totuselop.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_b59ff97858eb464dad6edd4c078de560.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_2b8375335f3a4f0c861f871f4e5c0ea1.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_b841a0ac9a924b739bcbf2280dabdc6f.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_f3b24acd536f420894474c4ea1eeb62c.pdf?index=trueIn PDF document text
    • http://bikawojesagoso.rf.gd/nadesosopujizekibudawo.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_913dc676015a4bbbbf7b1e97b6364c56.pdf?index=trueIn PDF document text
    • http://dinixebun.epizy.com/sezawevabodurubuwaweguga.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 5452 bytes
SHA-256: 0b7c96bffbbfec39aa85553cbb5cc2174e06df245ae4ead30661eab992dbe8e8
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10608 bytes
SHA-256: 2f0a61bb70a802cfd46f197609ca20b8eb50787ef11bc2eb382b03d893d81681

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