Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0765c175f0f538…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 13:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6113a42fd2c0b8234de3cb1219067496 SHA-1: b14221be5db1bfdac18edb9f3645ac150119ae6b SHA-256: 6f0765c175f0f538bdb00440edfa31e3bd9b369b2f9d7f0b95b619bd50af0181
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-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://mezovuduw.ru/wix?keyword=star+fleet+technical+manual+1975 PDF link annotation
    • https://safadere.weebly.com/uploads/1/3/4/0/134018032/1318781.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/antigenic_shift_and_antigenic_drift.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/cc0eaaefbcd.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/negatively_skewed_distribution.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/YTjfjet/chickens_for_sale_monroe_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/fX5Fzie/uefa_champions_league_teams_left_2020.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/silewajizagimewojabosuti.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/ledebalunowa.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ji1iejg/wijaniriginitop.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/5368346b47.pdfIn PDF document text
    • https://vakinora.weebly.com/uploads/1/3/1/8/131857586/toxojesej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufaxutunipoja.epizy.com/67822808852.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_f1d0c13737e7489baabef4852c610e78.pdf?index=trueIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/because_of_winn_dixie_full_book.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_8584f7e49b2848a5a462272cf1320e22.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_2b5b22596af34aad80359e613811874b.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_0d6d7a63c73947b3ab862922b002f305.pdf?index=trueIn PDF document text
    • http://gofosuxubajo.epizy.com/54232457044.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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5456 bytes
SHA-256: 89b425feb16115c9f916d57ab6361ae87da23a325b534419780a353495f5281a
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11176 bytes
SHA-256: 37431e63370b5db755a78f7a04f937651931fe6e4ecf743110f2bb1c58c9dfae

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