Malicious PDF — malware analysis report

Static analysis result for SHA-256 5823fd8b3133f4e0…

MALICIOUS

PDF

63.7 KB Created: 2020-11-25 18:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 36e60f7642ab38c1e8354712acd9d230 SHA-1: 90b06047e27a027b0f6770c33907fa5b07797188 SHA-256: 5823fd8b3133f4e0249d139e28a1cbbe8e2b959c75ef6a2e41dfd7d8c4ca9804
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/strik?utm_term=ar-15+ambi+magazine+release+anodized+-+red PDF link annotation
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/rigokamigap.pdfIn PDF document text
    • https://maguduvogusimog.weebly.com/uploads/1/3/4/5/134583052/xalobewofivapiz.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/c888e5b.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jenefemafawal.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/5681882.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/b3f0c5d4ced9.pdfIn PDF document text
    • https://bovexojegej.weebly.com/uploads/1/3/4/4/134481742/3135dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8400678b-69b1-4b10-b5a3-9a276b66fca6/kurekijagamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024bfb57-b1df-412e-80a8-223a39f38166/35524032128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15cc014-4197-4045-bfda-bf864c3b90d3/lalov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682588dc-1fc5-43e1-9919-066ff9972c66/pathfinder_shield_bash_damage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf8f5e8-ec0a-42ca-bf3f-739d4410c1fd/84323405397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14660e94-e12a-491a-b0c6-2f48ae90ba8b/dexemelunuludakowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314e5329-a5f5-4c87-ae5f-941faa372b91/rexamewatufoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6954677-d3d6-4dcd-968f-72090991758d/52294854859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a9c2b0-5602-4e77-9916-d5a5d08a1b9c/59420038102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba872886-b8b4-4f07-b7d7-0c931751604f/halfway_home_tommy_emmanuel_guitar_pro.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_off0000ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2C 5532 bytes
SHA-256: 49bfd0839933117f8255b5739a7eb6ea7d733a8afe4e3230d36f2e4b643bf54d
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 10820 bytes
SHA-256: 08b2386182f790e8f23bae2a616b8b4f08b61bc913b0fa22a7334a2141f06f66

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