Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eb8800b4f79878…

MALICIOUS

PDF

93.8 KB Created: 2020-12-29 14:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e12eb4c7a4f2dc6a3f5bd4b96a0b5369 SHA-1: 6526eb7effed2fe7aa2c954f64461559056eb396 SHA-256: a3eb8800b4f798782f026eaad0ee7215a3a7b7701f37d91cf5be09dd9a2c7b1a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'trafftec.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/wb?keyword=keep%20talking%20and%20nobody%20explodes%20psvr%20gameplay PDF link annotation
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/8482405.pdfIn PDF document text
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/xofinevogizorurom.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/1950498.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/iaih9N9/70730140311.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/WLCAJns/itranslate_translator_dictionary.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/nudemomujemezuduxi.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/neviwove/49800750020.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/vanizizufavato.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/22801987820.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/17062623997.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_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 5680 bytes
SHA-256: 103e58d4f35c736ff1f9f2970874045ece9146972090226600afe33592d25043
font_01_sfnt_off000143f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F5 11508 bytes
SHA-256: 26a439f56cdbccab2390ecb47bd6079253481ed811fd912f2dbde182d09a881f