Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f4075ae97424bd…

MALICIOUS

PDF

73.6 KB Created: 2020-12-06 17:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9695e5c75801a95cf34e1ccff7d51ee9 SHA-1: d6429f7e70e981f27aa03cba9095ae81b99ff829 SHA-256: f3f4075ae97424bd0b12cb5810fb933564d55dc8e0a128a5036f78b120aebb99
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=lords+mobile+mod+apk+download+2018 PDF link annotation
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/c1a35.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/6773562.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/tupexokunodokoz-fogemevanonikiw-gugiwabutilu-lopefetunom.pdfIn PDF document text
    • https://kavimexidulivi.weebly.com/uploads/1/3/4/0/134040988/7992382.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/4661874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fc7fc9e8ecca.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/tujopariwosekolebil.pdfIn PDF document text
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/7563604.pdfIn PDF document text
    • https://butitonivo.weebly.com/uploads/1/3/4/3/134314214/desewaxe.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/5753021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe113d9b1ed03538a25ccc/1606291775336/when_i_play_videos_the_screen_is_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33348c0-0158-48e5-b835-010b331b739b/distressed_debt_analysis_strategies_for_speculative_investors_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a81e612-a81b-4e77-8a01-737befb62369/sijelikowojejulujog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be702f00-5095-4472-9937-6bf611c6735a/wavugoxiniwululijed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5beed30-dc5d-4df5-a85e-0a45a5f83565/11469368805.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5864 bytes
SHA-256: c9aa98ad575da502db2fa28b998515a3b61f25a42e6a0309897bb823f5b1e119
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10920 bytes
SHA-256: c6eb85c618f9d90d5d74f8b512ee8004ddd0ea2e0ab35292f85c42086584d23d
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf