Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc55669d125cbbd…

MALICIOUS

PDF

69.9 KB Created: 2021-01-13 03:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7ea83bd9e27ec6349e1fdba1eeea8940 SHA-1: d86df0eb5b8496e2882703f7c2d9c2bbf8c4a382 SHA-256: 9cc55669d125cbbda392cef5b92b40e7516ae7c5a86dba34701c575665417be8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=been+vs+gone+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/jonuwezipagi/sjejdic/paypal_login_using_phone_number.pdfIn PDF document text
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/5a867746fe6.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/Bs1vhf7/sidez.pdfIn PDF document text
    • https://jijukufopu.weebly.com/uploads/1/3/4/7/134735153/jigoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/Mgi43ge/93914480456.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jhd6rFx/map_my_run_apple_watch_display.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ratixifo/leech_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/pollo_con_tajadas_hondureno_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/rewopuxitur.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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 5328 bytes
SHA-256: 329c7088cf79dacdc45a4e150fd59ca73c8a1939c8c40a006d2a64874e134579
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10840 bytes
SHA-256: 5a5d92e0cc944bf8e0b9aa29ab65ff58f444baab0e00f0f884b07cef59be618d

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