Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35904d2204d1055…

MALICIOUS

PDF

79.2 KB Created: 2020-11-25 18:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: be5c342282328ad20179a82ccf3c07f1 SHA-1: be968a18e40e03b3be743c59eae23fd7cc0feb4a SHA-256: a35904d2204d10556b328222f337022394dcea4f7e824da0d13667818b3b7dbd
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to malicious infrastructure. Another critical heuristic identified it as a link farm, suggesting a tactic to artificially boost search engine rankings or distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/123?utm_term=springmore+elementary+school+shelby+north+carolina In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5fa665d2c0043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5f9bb515b0e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5fb28f1a68a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fba1cdd0f188.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/6595711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5fb33eb5763ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fa4d199b5803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fa45b29a1ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5fa80f7c3902b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fa772d746223.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/putelekireza/adidas_performance_predator_tango_18._3_tf.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/vixeseviraroxani.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/grounded_coplanar_waveguide_design.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/kexel.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/wefomivisojer.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e3e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE3E4 13472 bytes
SHA-256: cebb680b813d23709e5717c7deca94e80f7f9c67155d8bfaa7ac95185e046769
font_00_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 5692 bytes
SHA-256: cae64cb57268acd2edd87c9b02bb7fdd600c9da2bb01e0f1227cc8b7bea02208
font_02_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10788 bytes
SHA-256: 968c878421c37b89ecf32019fc19a9b66990cc2d7f351b485ae6ca6ed30bdab8

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