Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b142bad4818e82…

MALICIOUS

PDF

88.7 KB Created: 2021-03-21 10:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a61cb7fd0a7a2773ac51d4c9eb9ab90b SHA-1: 0ba652a9a3be91f700a40ee71b8ac802a0fe7cfe SHA-256: e8b142bad4818e82649c1455661f8976d27aaecd5bbd47198c5715726426e919
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 0.9997

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=dota+2+angel+arena+guide PDF link annotation
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/roxakujerelaje_sesokazig_vanuto.pdfIn PDF document text
    • https://terenedadobi.weebly.com/uploads/1/3/5/9/135961601/pigovolujurol.pdfIn PDF document text
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/fikuxe-timim-sunikuwuzaju.pdfIn PDF document text
    • http://mosdendy.store/dish_vip722k_dvr_troubleshooting8c5ib.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/jaxidujoz.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/f8938897bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_60081cf812b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_604d2111ebdb7.pdfIn PDF document text
    • http://igonlinesupport.com/teboluxuledemixibofueyfcd.pdfIn PDF document text
    • http://fumigatoff.online/12070201682951o4.pdfIn PDF document text
    • http://chambre.xyz/mafebolodofefotakebexes5rpl9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_abb2cf65da604d69a7e538c2868bd513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/gonaji.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_7b4ba28e82fe45c3ab25ec12849b7f08.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_7659bb979ad44b69acf39faad356dec4.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_65f3ea258a5a443f8aa8e5b6dfbef866.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/37877309397.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/how_to_reset_my_kindle_touch.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_cf147d2691b4478596474e13fb46024d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/carlow_credit_union_annual_report.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_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 4948 bytes
SHA-256: 55892908330b8cd106a078a05db7f4e619084b02b525498b4ce1c37bb504f71b
font_01_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 11448 bytes
SHA-256: 19e60fc51a2b2ae96116ac12e8eb79c09950504840ac426601e6fe7d65f09962
font_02_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5