PDF malware analysis — malicious · ddece5a5d57fdd24

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 18:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: adb89f3d86e3134eddcbdfbf6b1c972d SHA-1: 1ce1b50a072485ad76aacb3b468db8d968c7c295 SHA-256: ddece5a5d57fdd24fcaf46c7053b514812fd2e085d951c44d9d5fed9f7acd316

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. Numerous external URLs were extracted, many of which appear to be part of a link farm designed to host malicious PDFs, indicating a phishing or social engineering attack vector. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://pistant.ru/uplcv?utm_term=lev+vygotsky+theory+early+childhood+education PDF link annotation
- http://bangtaisay.com/uploads/userfiles/file/tirekajegubawuli.pdfIn PDF document text
- http://wedooverseas.com/userfiles/file/39592627082.pdfIn PDF document text
- http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42444641450.pdfIn PDF document text
- https://ontogepszerviz.hu/editor_up/zaginedevepizu.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/tunivikirage.pdfIn PDF document text
- https://nonbodepsg.com/uploads/files/96512661375.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/52160115031.pdfIn PDF document text
- http://luijkzonwering.nl/image/file/15223128539.pdfIn PDF document text
- http://eia-edu.com/userfiles/file/3406205340.pdfIn PDF document text
- http://www.heksan.com.pl/file/6488118446.pdfIn PDF document text
- https://rrr71.ru/upload_picture/muvuxu.pdfIn PDF document text
- https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/resogolanemi.pdfIn PDF document text
- https://gencatakan.com/upload/file/rugexatujufudexasewutin.pdfIn PDF document text
- https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/rexosixabexekatuterugana.pdfIn PDF document text
- http://mazdooradda.com/userfiles/file/pazanibetetuxariluwopufam.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/mizagijiwizet.pdfIn PDF document text
- http://jyotiacademicpress.org/uploads/file/gebabugurokasajow.pdfIn PDF document text
- http://af.ssla.ru/images/fornews/files/gewesetiluzipepekujiluw.pdfIn PDF document text
- http://przyrodnik-kujawy.eu/userfiles/file/xalibiroxi.pdfIn PDF document text
- http://ydtmuhendislik.com/ckfinder/userfiles/files/gaxikuduta.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/vinigavo.pdfIn PDF document text
- http://www.prodomasa.com/ckfinder/userfiles/files/bulibelejuk.pdfIn PDF document text
- http://ordinate-ltd.com/file_media/file_image/file/tafakibusafodif.pdfIn PDF document text
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fewagajezevevidikokuzake.pdfIn PDF document text
- http://szintai.hu/ckfinder/userfiles/files/2383518172.pdfIn PDF document text
- https://medius.sk/userfiles/file/29687563429.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://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_off0000eeaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEAF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000106c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106C6	10980 bytes
SHA-256: `b78af084a8c9e08b0174bcf21213201f1af91eb71edd4305282387d9d5a89fe9`
`font_02_sfnt_off0001200c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1200C	17528 bytes
SHA-256: `51bf85396b7d799dac3325e61047d1bb6a00925622163096723615c6981e4fcd`

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