PDF malware analysis — malicious · b9fecbc9dd839164

MALICIOUS

PDF

90.5 KB Created: 2021-09-14 13:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b9ef75c8a51d684d03a54a65ff07d6c7 SHA-1: 9cbebde61a7f09c6758eeaa914d1dbc018ee44e6 SHA-256: b9fecbc9dd83916451bc9544b3abcb7cc3a4e64c3a742073063636c89d5eea44

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. This suggests the PDF's primary purpose is to lure users into clicking malicious links, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=desperate+housewives+index PDF link annotation
- https://serwisnawigacji.pl/userfiles/file/16394410464.pdfIn PDF document text
- https://protrialse.eu/files/files/bizotaxowafuwikug.pdfIn PDF document text
- http://tsnpharma.com/upload/files/41593428631.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/69497344518.pdfIn PDF document text
- https://jahanchart.ir/data/files/file/kojokurewoxebugiperikovi.pdfIn PDF document text
- https://egc.ecrom.work/syo/files/11071316132.pdfIn PDF document text
- http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/sokovunojor.pdfIn PDF document text
- http://longruiglass.com/ckfinder/userfiles/files/20210914_141510.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d591340b3f---lunenedevamazoxamijiva.pdfIn PDF document text
- https://topconta.ro/userfiles/file/lotavupoduputupejoxo.pdfIn PDF document text
- http://gshosnab.ru/userfiles/file/94542621025.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/jikamanofoz.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435f3c6c8f---34480670811.pdfIn PDF document text
- http://didula.com/img/file/reloburatelepiwas.pdfIn PDF document text
- http://tweddlefoto.com/files_contenidos/upload/files/noruranoruxomurakikokiro.pdfIn PDF document text
- http://cattaneoarchitetti.it/userfiles/files/64869345183.pdfIn PDF document text
- http://sns-russia.ru/userfiles/file/89725852705.pdfIn PDF document text
- http://rollfactorytogo.com/uploads/files/safajonefuf.pdfIn PDF document text
- http://davcpundri.com/css/file/sewuzelezegu.pdfIn PDF document text
- http://rinsacars.com/files/others/62182667141.pdfIn PDF document text
- https://ags-car.60km.com/upload/files/tidazateditubogaduzopile.pdfIn PDF document text
- http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ronefulim.pdfIn PDF document text
- https://clubforeducation.com/FCKeditor/userfiles/file/82666338885.pdfIn PDF document text
- http://dsfly.com/uploads/files/33238786926.pdfIn PDF document text
- http://dasbluemchen.com/rolatukuwari.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_off0000fdcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDCD	17456 bytes
SHA-256: `ba1d59cbe26ed15cf10fe1977779367466ced8c190cfd03f2fb0406a668e2d51`
`font_01_sfnt_off00012b3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B3A	10800 bytes
SHA-256: `96a400e840d589c376f2938dc6df663e480f3992804393bc7a7c99fa6ec96efa`
`font_02_sfnt_off00014431.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14431	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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