PDF malware analysis — malicious · 428ccc660a6db171

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 20:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7418cffaf7e96ab57ef0b83d89da751a SHA-1: e52002166a16bb7c7961e748bb4c5fa7473ff86b SHA-256: 428ccc660a6db17135ab7f791059839ddf5ece6bd28246aa9130c8f8d646681c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9931

Heuristics 5

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.
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://smidgel.ru/uplcv?utm_term=keep+your+head+up+andy+grammer+chords PDF link annotation
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17332288686.pdfIn PDF document text
- http://rambud.pl/uploaded/file/36322585647.pdfIn PDF document text
- https://alhasooncorp.com/Files/files/sotawuvuzusami.pdfIn PDF document text
- https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/75770928973.pdfIn PDF document text
- https://hostsolutions.ro/app/webroot/files/userfiles/files/sutojexirububeviturepit.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5f40e727---vubesuzopedezatunex.pdfIn PDF document text
- https://sensiblemachines.com/ckfinder/core/connector/php/files/lorufaxifovowud.pdfIn PDF document text
- http://prasongp.com/file_media/file_image/file/xisimotimewim.pdfIn PDF document text
- http://ms-beauty.com/ckfinder/userfiles/files/vukalunepobivikigifoxeneb.pdfIn PDF document text
- https://nppmaudaha.in/ckfinder/userfiles/files/nonisuxe.pdfIn PDF document text
- https://hyundainhapkhau.vn/upload/files/tumawalazonesitixiw.pdfIn PDF document text
- https://nirmalujjwal.com/public/ckfinder/userfiles/files/37678874963.pdfIn PDF document text
- http://shiokuda1.com/contents/files/15953183983.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/59149867619.pdfIn PDF document text
- https://tenfci.org/userfiles/file/31250046576.pdfIn PDF document text
- http://hosteleriayvending.com/ckfinder/userfiles/files/70014003623.pdfIn PDF document text
- http://www.farmaciavictoriayjmleon.com/userfiles/files/zuvebosoduvugotizilelov.pdfIn PDF document text
- https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/kuxusanusutizona.pdfIn PDF document text
- http://robedecreateur.com/img/files/20463009292.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/6906278487.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/disakizofod.pdfIn PDF document text
- https://honkakuji.jp/honkakuji/images/ckfinder/files/zikovakovidege.pdfIn PDF document text
- https://sunsetlearningcenter.com/userfiles/file/24840432231.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c9cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9CC	18064 bytes
SHA-256: `62c20140e837a8bce9d422141faf84d0518219fb2e89e1d13ade915a19fe3990`
`font_01_sfnt_off0000f904.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF904	10928 bytes
SHA-256: `52fdc76cce97ca48831a497662168b13412b23a2aadca3c6377cddb0aa32b85d`
`font_02_sfnt_off000111ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000129fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129FB	16148 bytes
SHA-256: `b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59`

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