Malicious PDF — malware analysis report

Static analysis result for SHA-256 497e5923141d7d7e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 20:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff90aa069e6b2848da6c3fdba07ee036 SHA-1: 177d103b9e068b7469f73a3878ad2890b7b862d7 SHA-256: 497e5923141d7d7efe745bf8a657f17dcf186ae46bdbca4e8d7ac588a9e3cc52
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 0.9989

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://jumiwimov.ru/123?utm_term=miracles+performed+by+benson+idahosa PDF link annotation
    • http://meetchambre.xyz/adecco_group_annual_report_2017l617j.pdfIn PDF document text
    • http://fortuneo.best/levumapaxefenisonazoxin2.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/kivirixikapap.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/9580096.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/5cb3b457e.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/diaiggj/north_star_casino_win_loss_statement.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/clq5jfl/2020_bell_helicopter_for_sale.pdfIn PDF document text
    • http://tekplafond.xyz/wigoretedugumunazebokopozs097t.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/29005429691l3s46.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/3f43a7e8b72.pdfIn PDF document text
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/8262805.pdfIn PDF document text
    • http://about-fb-support.com/manual_de_entomologia_agricola_comprar7pemb.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/gchaC4y/movie_prime_cast.pdfIn PDF document text
    • http://gbo.guru/how_do_i_reset_my_lexmark_printer_to_factory_settingsf4tnl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_f8bce657f04546f9a47bac6b9c0b8732.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_6cc89cfb945c4c54b804e7c954c753ea.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_633aef1347ce467d8a15d93a050ee5dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/luvirowesu.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/22148650851.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/51002553568.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_670b5e943b104cd9aa098070e2ab4360.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_a27625ab3c88463ba1cd147fce931c61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/detosujavotelaso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5348 bytes
SHA-256: 6c5b58f8fed7984d58f1b74b549fa20d15dd7495e09e2ad1968ddafb44519063
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 11360 bytes
SHA-256: 8f18a1ca1110381850bebf5854ab18633de713dc658a3b823d61954585199f25
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f