Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eb437327fe697e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 08:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 584c6ec199240146c9a9225793c9c8d0 SHA-1: 200876d5db3a439c4dde8d42dae3585d03e8aefd SHA-256: 28eb437327fe697e74a809ead9a388638480bddc7197cbbc2102ccf4d7f07342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://s-privod.ru/userfiles/file/60482540711.pdf In PDF document text
    • http://ilkjv.com/Images/Media/files/bixewux.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/zejodolukuri.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/73297881337.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/balidedimogodelilozazo.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/22748252211.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3bb4882d---16593937420.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/pojekutovufaferodibinidi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/tidivexexanosiwajigu.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/bonekuz.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/jeturilagatukunojukivuwok.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/14724304259.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/rotedodapotap.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/27298154265.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/29607773579.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/79163033659.pdfIn PDF document text
    • https://austarpharma.com/upload/files/19054398777.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xalelinipazudawemenip.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/63416406869.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/71257513072.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18128672184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=indian+train+simulator+unlocked+allPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 10672 bytes
SHA-256: 8e6d0de09ac836d6c9df0ab6ff6ce8236da36c8b33d9891169612cdd37f00b3b
font_02_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16244 bytes
SHA-256: ef6ff05eedecb4d4b87316b12cec0b68425623a9bd238cc77abe480b18743e09

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