Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5f54998b1643a8…

MALICIOUS

PDF

63.3 KB Created: 2021-02-19 17:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f5bfedb8290bfdba627762407e747978 SHA-1: 9567c1b85d65e5254248590dcc02bfaf0d31d0e5 SHA-256: ad5f54998b1643a8be17f42af70cc978f51768c441b49e219a52705699c86a87
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary workshop answers'. The presence of PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics indicates a strong intent to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=vocabulary+workshop+e+unit+3+answers In PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/4553531.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/heugeif/tobuvixurivabo.pdfIn PDF document text
    • http://itali-big.space/piledadimemosq65xi.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/bimonan.pdfIn PDF document text
    • http://leduxebawini.22web.org/it_security_incident_report_template.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/gawepavovikuvakipadim.pdfIn PDF document text
    • http://sberbank.services/8608286560739mpg.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/2515026.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/gjgdsw6/29476614005.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/4564536.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/xufaxoferugod/30606654857.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/antibiotics_used_in_dental_infections.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/dispute_item_on_credit_report_equifax.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/athlean_x_ax1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/govar.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_off0000ba04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA04 5548 bytes
SHA-256: 658a44f972b4a3a7ee632da0453c4172dcd984018d985449096d945b8b23a696
font_01_sfnt_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 10408 bytes
SHA-256: 72c46e21e44ac9afd641b0425a3adfdb113e87efd2225f49ee2171680c4e6699

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