PDF malware analysis — malicious · 527c88090e54eb92

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 06:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 74971c90682f7f2fd930ec21e0ca387c SHA-1: 77ba6a5ea7bdb13e5032e97e57e3fc68f2975f10 SHA-256: 527c88090e54eb92e23889f25065151625405d887b85ef986e654d1fcfbb8257

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous links to disposable domains, indicating a link farm likely used for phishing or distributing further malware. ClamAV and ML classifiers also flagged this sample as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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 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 http://malir-naterac.info/UserFiles/File/seninedu.pdf In PDF document text
- http://ahjygjg.com/upload_fck/file/2021-9-9/20210909062616660653.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/70734874482.pdfIn PDF document text
- http://bobiniauto.com/userfiles/file/16148866841.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161320082190ce---38989209354.pdfIn PDF document text
- http://cyclad.org/UserFiles/file/17824931733.pdfIn PDF document text
- http://rivebistro.net/ckfinder/userfiles/files/60276881263.pdfIn PDF document text
- https://kemxoi.vn/app/webroot/files/images/pages/files/bokovesiroduvaguwaneded.pdfIn PDF document text
- http://venkateshservices.com/uploads/nefobutanupuzowo.pdfIn PDF document text
- https://ppkh.net/userfiles/file/89026160160.pdfIn PDF document text
- http://blow-w124.com/js/upload/files/napisoxukumofobuso.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/43201295952.pdfIn PDF document text
- https://anglarill.net/userfiles/file/pedunovexawiges.pdfIn PDF document text
- https://lexconsulting.ro/webroot/files/media/penubitosovuxewafexumo.pdfIn PDF document text
- https://a-metal.e-giant.net/archive/file/files/nosuvibozaf.pdfIn PDF document text
- http://hopkim.vn/upload/files/kajesokuzinamib.pdfIn PDF document text
- http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/mesupekexamoxepijumi.pdfIn PDF document text
- https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/19047952256.pdfIn PDF document text
- https://soechi.id/userfiles/file/jagurimigutama.pdfIn PDF document text
- http://marcelponjee.nl/ponjeefiles/file/27276417914.pdfIn PDF document text
- http://mariautonoleggiomarsala.it/userfiles/files/50550625538.pdfIn PDF document text
- https://hiroyoung.com/data/files/25536477954.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3231d917127c71b679923f29ad8ea219/xokomidewiwobojutubuna.pdfIn PDF document text
- http://semihkerpiccilervesupersound.com/upload/file/zuxapebafumi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+native+screen+recordingPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000de35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE35	17440 bytes
SHA-256: `51d6fccfc585e5aec07963f7da02cc6bec3cacbd1d403e2f4b6ffa371500bd1f`
`font_01_sfnt_off00010b0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B0A	10544 bytes
SHA-256: `4f003e12656f71ca8844b0486e8771825ad0a041a3454284d97a65ffd6cc5c99`
`font_02_sfnt_off00012306.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12306	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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