Malicious PDF — malware analysis report

Static analysis result for SHA-256 741a1c94b8fce3f3…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c630efb2e458242b9181891caf064bf5 SHA-1: 913321876c06220ebb08ce2d2b319c8469a6714b SHA-256: 741a1c94b8fce3f39ac71184603d0b7dc76a250286793560c6ce5735685845ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=osi+application+layer PDF link annotation
    • http://najlepsietorty.sk/uploads/fck/file/nixuzadiniteponofeku.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/25288309400.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/10847201233.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109201421224903.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/27259904096.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/visaxima.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/64679251690.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142006a06f24---xudakazonubof.pdfIn PDF document text
    • https://masihpt1.com/contents/files/dezujeg.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/8741265963.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/rivijesubozutegolanin.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/78118431323.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/52ac8f.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gerosejikumomi.pdfIn PDF document text
    • https://ptogel2.com/contents/files/vaperopi.pdfIn PDF document text
    • http://szm.hu/userfiles/file/82879502543.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/lujodi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/71015031903.pdfIn PDF document text
    • http://salt17.com/userfiles/files/daridinuvufobozozakowagot.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/lebofenebomajijito.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kakewa.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/madowilezezoselolodiguj.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://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_off0000c096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16732 bytes
SHA-256: 4d4a9b4488023dedaff05a4dae741155a026b8792bcb5a3491dd8724a58a2f9d
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 10504 bytes
SHA-256: 163f83b0258704805d5fb0aa6229ee58aeb5ca8d55d3fd687584a48270fc770c