Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc9f73cac55bec4…

MALICIOUS

PDF

79.1 KB Created: 2021-02-20 06:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6f646c96d3d09cee9efb60f95761e118 SHA-1: af2390ffbd2a05e931b4c598849479f7c09995ff SHA-256: bcc9f73cac55bec4132998db28240c9f88790f807aed62fb6c58a511dc14e89d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to redirect the user to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://druttle.ru/strik?utm_term=how+to+turn+on+a+bostitch+air+compressor PDF link annotation
    • http://bettermoneytips.com/mudobanetadobelodosibuwa51d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482858/normal_600582c7073fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_600c84e938bf0.pdfIn PDF document text
    • http://jushq.club/credit_report_dispute_transunionicsc0.pdfIn PDF document text
    • http://loxigedu.iblogger.org/59103452873.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/sigijixutuve.pdfIn PDF document text
    • http://livecopyrightverification.com/harry_potter_deathly_hallows_free_downloadttq4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11afdd2d20.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/9200653.pdfIn PDF document text
    • https://cdn.sqhk.co/palevisi/gjc5G9S/can_decaffeinated_coffee_raise_your_blood_pressure.pdfIn PDF document text
    • http://vinamituloj.22web.org/80568012286.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/dajobagudofaremi.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/rerokigijuziva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff982b88883f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419205/normal_5ff33995087d8.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/zosevid/terraform_aws_iam_role_count.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/new_birthday_party_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/un_cadaver_exquisito.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_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 5332 bytes
SHA-256: d9c5d83bed4a2696545cfb23a4a7f363bcca8ca703b9444aa92afa293ed3c441
font_01_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 10368 bytes
SHA-256: 0132f3da40bbe2327def11e5936c4d22db26d4e28503b268eb51a8e32b1386a3

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