Malicious PDF — malware analysis report

Static analysis result for SHA-256 1671f17f541a1add…

MALICIOUS

PDF

76.3 KB Created: 2020-12-23 13:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d028e3391213d3f48b6421665013e4f SHA-1: 728bbb559837645f14a09b0f91b1146fec97abac SHA-256: 1671f17f541a1add751caa901c677d05a7ee92c4561ed83548e53ac09a07d000
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it is a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly support a malicious classification. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=best+granny+square+pattern+book
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/bomajejasumalogu.pdf
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/mesivurukit.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5faf3db5541c8.pdf
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/a9df245.pdf
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/9667258.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8b43e7111ad.pdf
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/67a9519e8ee2fb.pdf
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/ximun.pdf
    • https://vazitaxigenot.weebly.com/uploads/1/3/4/6/134640409/8984067.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fa345bc2c2a9.pdf
    • https://cdn-cms.f-static.net/uploads/4503787/normal_5fb0260530c06.pdf
    • https://cdn-cms.f-static.net/uploads/4412575/normal_5f9ce5046efb3.pdf
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f95b5c53bd71.pdf
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fb3ca55074b1.pdf
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/4161544.pdf
    • https://sovirolozemeze.weebly.com/uploads/1/3/4/3/134337586/8560142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/batiku/jasper_report_odoo_9.pdf
    • https://s3.amazonaws.com/jozaponi/bubble_trouble_game_for_computer.pdf
    • https://s3.amazonaws.com/remuv/pharmacist_working_conditions_at_cvs.pdf
    • https://s3.amazonaws.com/nowokil/optex_vxi-_r.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b9.bin
033fc1ac91f7f3f35676e4625b71c30bf4b17cfdd83ab40c7182759fdf2b51cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 5436 bytes
font_01_sfnt_off0000e94f.bin
df73bfe94c42b10bd14c22e01b4a88a8c6f5a17ad5f3574f226a4f96d5975bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 10888 bytes
font_02_sfnt_off00010e51.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 16312 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.