PDF malware analysis — malicious · 5fc26f99d8d76e06

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 13:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: bcdbd25aa128a16ffa272d9e43c636a9 SHA-1: 8f75f9a667f3d80de46de2ddafff122ce2877ef7 SHA-256: 5fc26f99d8d76e068fcdfa32860627e1d7691667c76702a87f74c845ff6f0e99

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and EMBEDDED_URL heuristics. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests these URLs lead to a collection of disposable hosting sites, reinforcing the phishing or malware distribution intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=download+instaup+apk PDF link annotation
- http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
- https://yellowstonewildlife.com/pokirotuga.pdfIn PDF document text
- http://unionnutritech.com/upload/files/16732380034.pdfIn PDF document text
- http://3t-t.com/User_File/UpFile/file/20210902151903_MzIzNzU0ODA3MQ==.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/67389872101.pdfIn PDF document text
- http://byty-pardubice.eu/UserFiles/File/gilunezixumidenudu.pdfIn PDF document text
- https://alihuata.com/userfiles/file/wotejutavemiketuvipag.pdfIn PDF document text
- http://chandravanshi.com/userfiles/file/69280951235.pdfIn PDF document text
- https://vroa.pl/chplusfiles/file/dosagidarowurebik.pdfIn PDF document text
- http://bainihu.com/upfiles/editor/files/69452308380.pdfIn PDF document text
- http://thaihotelsale.com/FileData/ckfinder/files/20210910_C3A1CA938B8BF16B.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfe23de8a---8404711154.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtq5kh6pqr42ukro4h6tvg0dk7/gakiririjewule.pdfIn PDF document text
- http://xn--or3bi2da319p.com/upload/fckeditor/file/potob.pdfIn PDF document text
- http://malir-naterac.info/UserFiles/File/21093416609.pdfIn PDF document text
- https://abogadosaccidentealicante.centralcms.cloud/galeria/files/29796039818.pdfIn PDF document text
- https://greenline.bg/userfiles/file/kodudajuwimoduf.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/sijajutul.pdfIn PDF document text
- https://funcarele.com/ckfinder/userfiles/files/sefefolaxexusevu.pdfIn PDF document text
- https://myshalewell.com/userfiles/file/neselojowatob.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/35022730657.pdfIn PDF document text
- http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jepove.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/gufad.pdfIn PDF document text
- http://w3-japan.com/js/upload/files/mutogosixovokitabimiki.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_off0000dd19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD19	10432 bytes
SHA-256: `3e95a44d8f44a984840963566edf2cfe11746e864d83d5f67f525ee2d994eeb9`
`font_01_sfnt_off0000f4e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E2	17964 bytes
SHA-256: `f9725876f49cf5af266562534e095b3c65cf95d938fe453aa2bf2e73d7b1ce6d`
`font_02_sfnt_off00012358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12358	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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