Malicious PDF — malware analysis report

Static analysis result for SHA-256 4401f91417b276a0…

MALICIOUS

PDF

70.3 KB Created: 2020-12-31 08:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd3475fb903bb2dfe7f5f638cad81f40 SHA-1: 5dcc24c06b26279fe88d711d61ba6d56f0627d9f SHA-256: 4401f91417b276a07bcb394e435b470dfbd7dc209a8f4ebd335ef5b69edc3a90
156 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 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/123?utm_term=sri+ramachandra+student+login PDF link annotation
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/1032321eefef.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/CkkkXgh/selojejob.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/fggK1ha/hacker_simulator_tycoon_mod_apk_1._0._6.pdfIn PDF document text
    • https://portal.sriramachandra.edu.in/SRUIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kakef/50240065816.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/debobopipexikiwunamiwanos.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/graphing_exponential_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/kaxifofuxejuzojigowetob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9bddb5-b675-47b3-98e8-c3d407be048b/17767128424.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/dota_2_guide_indonesia_necrophos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12900539-2483-4c51-bfa1-ecd6bc181811/vuxasufeboxivebikove.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/mevawupomuguwagovivi.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/9649258416.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 5456 bytes
SHA-256: 1fdb2ca9f57e65c98631bafd0a989b47ea8c97aa516b855d0bfebcd34fecb740
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 11212 bytes
SHA-256: 62db3e2575241720261a6a3691b2810cbe4cefbe19865e0ebff1632a44faf2f1