Malicious PDF — malware analysis report

Static analysis result for SHA-256 4261533494f583ee…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 20:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2449dde49422d07d683eb604681b96dc SHA-1: 9c5316a3c00eab3ca923275e41133390825da59f SHA-256: 4261533494f583ee446cc068cbee64bde13acdcf6f7f39c06602755975d382de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xezojetit.ru/strik?utm_term=how+to+heal+plantar+fasciitis+quickly PDF link annotation
    • http://xolokukifimiv.sportsontheweb.net/jikarasuzumoneluv.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hhgf0W4/orange_spiral_notebook_wide_ruled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5fd17a2a8900f.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/25175364883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6013ae8ad1456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_6014f0e96e0b1.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/hchdid6/70210776440.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/1991087903.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/iwhLjeh/65593996636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_604f25fc4a50b.pdfIn PDF document text
    • https://cdn.sqhk.co/jidimupov/Cfgdzhf/virebivezosopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fff227b27ed7.pdfIn PDF document text
    • http://jarokixepoweso.mypressonline.com/norominafubijidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_2d8b2616fb7e4a998cac5d63b82cff99.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_be666c7b3a2e418994269ee32b09994a.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_c9ac07796412481f82ba694d84355add.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_35dcecee4a3f4b0189740124745e9de6.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/validity_of_research_instrument.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_3516b7cf3c5e4c5d8ff95a94137b6042.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/74795460866.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 5328 bytes
SHA-256: e89052219e3a1ff1b84c5dd686a326bbaac83340f7b6d45f7aee98c27ae9d822
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10916 bytes
SHA-256: 26095e353458faf6d848eb719934fb1b74e633f39503b590276444a98c147f5e
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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