Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bf56db0168fc49…

MALICIOUS

PDF

73.2 KB Created: 2020-12-23 00:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 64639ed44f6d4146dc48dea076bcf3f2 SHA-1: d7832c3df6dd9e198dbde4d83c4e3535b60e2646 SHA-256: c8bf56db0168fc495cb38b0198a4b9cae6fca993b35ec4e50b2112130086d059
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafficel.ru/strik?utm_term=super+slow+mo+s10+plus PDF link annotation
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/dekek.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/pafuwajejemeve_majukuxigixuvu_nebixas.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/lulelepese/xemivavogu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc174bcc89e1c4b8fc25c90/t/5fd1f803ce71ee580faf294a/1607596040009/warlords_of_aternum_how_to_get_cores.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/6421272805.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/steel_low_profile_platform_bed_frame.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc111025e8e827d428ec193/t/5fc53e1cf8cdb769c68e762e/1606762015850/deuter_guide_30_sl_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e60d259-75db-4016-b189-b79f4b911be7/juegos_de_colaboracion_para_adolescentes.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/45173036116.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/74623746025.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tatuxekuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/wuresunexazixox.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/99907079372.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/padirozetemowepiwuwepisi.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/minecraft_hacks_wolfram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1245dffd-0c1d-47cf-a598-f79730ccafb4/nifodegawux.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
    • 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_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 5144 bytes
SHA-256: e895b23dcf454bd66c1a0b25fdd31b2ad7093327332c926572a8edb863704683
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 10568 bytes
SHA-256: defe9104db310c5b62507c5f6b19e1e2be13d4733acadeab353fd79862c021da
font_02_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 16136 bytes
SHA-256: 8d0ca5441952925faa6f68d28470995fcd5e3edd800b1977fac83179433ae1db

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