Malicious PDF — malware analysis report

Static analysis result for SHA-256 97135fb0130e7bf0…

MALICIOUS

PDF

108.0 KB Created: 2021-06-05 13:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c5103c0aebcb897158f39c6d1d5669a SHA-1: d4f3fd7372f75f546d3b3c6b335f478451b5c1fd SHA-256: 97135fb0130e7bf0ae3411edd54b4682d8a253b8440acbee81c9dee3ab086b44
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://crewmak.ru/pbw?utm_term=mysteries+of+easter+island+movie+guide+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471682/normal_60025a1f100c6.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/zelomikodaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_601432aa1ed57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5fd08bfe54b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fdbff5734bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5feec1d1581ec.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/rakufemijisosaxasiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_600d3ca0a8fe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5fddf47ca950e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5fdea30d63176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6011276c6b4b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5fe104d66a092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_600e13f674834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevuxowina.pbworks.com/f/nojukalelupaparasemagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c975a62-e275-4d13-9e2f-d7db4d120133/how_do_i_fix_the_red_light_on_my_tp_link_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2920ce97-93e0-4f69-9754-897ca72be3d4/nariku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62590f8a-0c28-45c5-b64d-8eb25113a18c/tezumisevigovaze.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426507/87186256668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b5732d-138b-41c5-946f-bc84459d036f/95444275047.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_off000169f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F5 5484 bytes
SHA-256: 83489ff434bdef1c27423525e9936ef98bbc0cda2c81dc7615b24f9b8a359656
font_01_sfnt_off00017cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAE 11152 bytes
SHA-256: e2af2e2a37dfc92ebb452b0e85e8a41b3ddb847f161690b7c54cc5aa56e8c91d

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