Malicious PDF — malware analysis report

Static analysis result for SHA-256 183369a9b0ff3460…

MALICIOUS

PDF

94.4 KB Created: 2021-03-13 16:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd26582553d49202d7b1af19d50b7e55 SHA-1: 5aa49393f229ed74bd52aff260721b7d76cbdb69 SHA-256: 183369a9b0ff34607aefb946f90e3f41f031ec5d1f51d5e4545632db236e8556
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://kuzutuzo.ru/wix?keyword=senzu+sharpener+price PDF link annotation
    • https://pakopigame.weebly.com/uploads/1/3/0/7/130738837/madobodu_vukuganelelixel_vikolo_fabugoli.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/tudaxusizivujexoko.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/senoj_gubuzubepe.pdfIn PDF document text
    • http://vinnipoh.fun/fotudejibeloxuziratatowin7qzh.pdfIn PDF document text
    • http://flymoney.net/kogofovenosejalaxowazexugadid9.pdfIn PDF document text
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/pinepo.pdfIn PDF document text
    • http://goodxday.xyz/bofivoxufaxekazojudovenix2jlc.pdfIn PDF document text
    • http://mastericy-chistoty.ru/microsoft_office_for_mac_price_in_indiaqf1an.pdfIn PDF document text
    • http://wrinklestiltskin.com/chemistry_2019_answer_key_karnatakaa7mhv.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/5a202f917015a0.pdfIn PDF document text
    • https://tuzupenaxu.weebly.com/uploads/1/3/1/4/131454165/vowumurudixeb-gogiwokuk-fijazudisal-dakux.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/pukasebebejis.pdfIn PDF document text
    • https://witaveju.weebly.com/uploads/1/3/1/4/131452735/fa7a8a9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_d01b4c6d9a9f4c1f99771e03925ebaf3.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_8128be5aebe64690804b16480894e280.pdf?index=trueIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_85870f5ebbcd4a37820a6b87cc16996c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea558c83-4b56-4255-9dbc-a8967da70474/dream_of_dog_poop_in_bed.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_e40272300e834a0bbec4a0540d5c27e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4422813-560e-4dcc-8668-bfdf91496e7a/jamatigeporejudamojevezov.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_b5d815dc83474111ae11c33e9d5c4f77.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_4d90746e4c3c4bb7ac3be996fdac0649.pdf?index=trueIn 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_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 5140 bytes
SHA-256: fefd454fbf6428799d15a058cc394e6f79535429b6ef93f24aa6825f7aea5c07
font_01_sfnt_off00014661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14661 11132 bytes
SHA-256: f297e8314e51ca77e3a7eb1451f0ba45043e6952d4286158c3f90854d599c8ae