PDF malware analysis — malicious · c5b351bf12f86ff2

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 04:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 39a71982e220ed3754e50cd29f9717cc SHA-1: b7872adfbf7e82393662087e136bd6ca6c07b002 SHA-256: c5b351bf12f86ff2e9ab6cf491e3cc0252301450a12235a6b640efc8b36f4dd5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm heuristic, and a 'download button' lure suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://medvor.ru/uplcv?utm_term=naruto+shippuden+psp+games+free+download+for+android PDF link annotation
- http://avon-bratislava.com/files/files/13126819921.pdfIn PDF document text
- https://108pizza.pl/uploads/userfiles/files/fufokesoxokotanisakeju.pdfIn PDF document text
- http://www.farmaciavictoriayjmleon.com/userfiles/files/refuveg.pdfIn PDF document text
- http://cuiquji.net/d/files/nomaregona.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/gekubemurifinoxovipal.pdfIn PDF document text
- https://swapnauraan.com/ckfinder/userfiles/files/litobobokikenoxax.pdfIn PDF document text
- http://tehnicgaz.eu/files/file/gewowimapixetatiguka.pdfIn PDF document text
- http://de.ruben.pl/ckfinder/userfiles/files/94567367751.pdfIn PDF document text
- http://thy-environment.com/userfiles/files/woborigelilaripixagagu.pdfIn PDF document text
- http://relaxzenter.com/uploads/files/guzumaregowiko.pdfIn PDF document text
- http://osteriadelcampanile.com/userfiles/files/75117640058.pdfIn PDF document text
- https://comfort8889.com/upload/files/38215140351.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/sijakizolididivilufap.pdfIn PDF document text
- http://cesurmakina.com/userfiles/file/ronexofovidazid.pdfIn PDF document text
- https://g55net.com/webpagebuilder/ckfinder/userfiles/files/dovozofefojarikizorizabuv.pdfIn PDF document text
- https://samsungklima.net/upload/ckfinder/files/sudejibamorodefaduto.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148251c561cd---nowebakobamivubim.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/71675435587.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/97154630260.pdfIn PDF document text
- http://www.deep2001.com/images/library/File/37112690719.pdfIn PDF document text
- https://1877painters.com/FCKeditor/file/suwofidalufelimotujo.pdfIn PDF document text
- http://tentauto23.ru/ckfinder/userfiles/files/64354157195.pdfIn PDF document text
- https://delphin-bau.com/ckfinder/upload/files/pirezowar.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/suzatitazisigaz.pdfIn PDF document text
- https://hockeymro.ca/docs/file/banera.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_off0000c2cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dade.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDADE	16908 bytes
SHA-256: `193081bf95f98bd622b4af8b987c4014323f18b9ec50418dcd2bae151b24e78a`
`font_02_sfnt_off0001065b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1065B	11108 bytes
SHA-256: `5432c12eededd1f227bcd935d5438668a799b1010a4e0def2fe79bd32d643b51`

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