Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb197d217ea828d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 21:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22fe3168f8c8f3b30e34b2b5bbe8b8ad SHA-1: c3b7b0fac9a93bd67014cc37153a4556df6a757e SHA-256: 9bb197d217ea828d914c870223c9ec60562fd4cbc40d54e742d781d17dd4c5c8
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 0.9997

Heuristics 5

  • 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.
  • 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=why+is+my+power+pressure+cooker+xl+not+building+pressure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601ee37ac6ed4.pdfIn PDF document text
    • http://helpforteam.com/frigidaire_washer_and_dryer_stackable_kitofzj1.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/549236.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/cjgp4r4/jedewewenixadidozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff2dde8a21b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410956/normal_600210bc6ee2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5ffac56f8600e.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/xakapudakadu/magnetism_5th_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/azkar_almasa.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/porcentaje_de_cesareas_en_mexico_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/jurnal_psikologi_budaya_organisasi.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/51419938786.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/dexutazobiruroneweri.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/38645715007.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_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 5756 bytes
SHA-256: 627553339a4b85d1b1237f110b2f3643109393991547e489b8ef7141300fa5db
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10580 bytes
SHA-256: bcaf2c516978b9a3748a5539270d7273e9594f65c490e921891c32e56f8a76a0

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