Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6928a5655020f1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 13:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9aefc227d3ed1e56c665cfaaec9c455 SHA-1: 7470463489d8275904caa7cdc297f54952fc2d72 SHA-256: 0a6928a5655020f19e29aba352d5531c7000a41daa7e333b7bc260b32ffb9adf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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 http://vakaruinzinerija.lt/userfiles/file/vijikuworuvetufupunosu.pdf In PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/11769316553.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210913122652143551.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/381024861.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/13749357384.pdfIn PDF document text
    • https://udruga-invalida.hr/files/gozibivosevazekujozetude.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/17375255960.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/52507990048.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vibakikoradomupeselup.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/2083039479.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/85234770080.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210916063433453.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/11496417713.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vufoqefpta0hr185juskte08ei/70386988822.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/4841291170.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98734568913.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vosiz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k1qbd2ck1682rlb2di4ichat87/sitovamilekawelelidafal.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/32663703610.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/zeloguvobutonevabavog.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/43347105763.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///7239008073.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210918_3F9C898D159BE67C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+10+pro+max+front+camera+sensorPDF link annotation
    • 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://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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 11056 bytes
SHA-256: b06a7864560d2876cf3ca3488a3e89f7957208136ca7a2b7faf363e90d158800
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 20000 bytes
SHA-256: c40decf62af955dbea86bd313f82fb8c42f17ffe6cb4c94631a4f735bb0bd967