PDF malware analysis — malicious · 683c573b623ae292

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 20:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: c8a5461c9b2fef10dc244db96b23e824 SHA-1: 116d47537f616d15d33fa7c25106544ea4e2bcd4 SHA-256: 683c573b623ae292105373b72e374c433ad161a33fe88935c89574a7646b9143

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a download lure. The PDF structure and embedded content are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=cupcat+apk+download PDF link annotation
- http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95634676348.pdfIn PDF document text
- http://vincentianssjp.com/userfiles/file/kuvezu.pdfIn PDF document text
- http://ccsctda.com/ckfinder/userfiles/files/20210911_021707.pdfIn PDF document text
- https://biharlokmanch.org/userfiles/file/pijisodowesolaja.pdfIn PDF document text
- http://studiofapas.it/userfiles/files/tibofifovijovominuvikir.pdfIn PDF document text
- https://dazhonghua1688.com/ckfinder/userfiles/files/fuxasagi.pdfIn PDF document text
- https://zaindu.drogomedia.com/files/galeria/files/72850333463.pdfIn PDF document text
- https://gdaniec.com/upload/files/27076559205.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133539944f17---91532017372.pdfIn PDF document text
- http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/67264421001.pdfIn PDF document text
- http://geometramaurotozzi.it/userfiles/files/63988149229.pdfIn PDF document text
- https://iieng.org/editor/ckfinder/userfiles/files/zefavorusen.pdfIn PDF document text
- http://yds-wcv.jp/free_images/files/99942099608.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16140e96fe4864---fopurejomuwojex.pdfIn PDF document text
- https://jyapa.com/jhuoyue/uploadfiles/55738580611.pdfIn PDF document text
- http://camelliafb.com/uploads/files/202109092059573095.pdfIn PDF document text
- http://aptekarynek.pl/zdjecia/fck/file/tapememelimujifusukeka.pdfIn PDF document text
- http://bibrka-school.org.ua/ckfinder/userfiles/files/munepibelobuxa.pdfIn PDF document text
- http://bitree.net/ckfinder/userfiles/files/55224162311.pdfIn PDF document text
- https://tramtron.vn/uploads/files/files/67868080317.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/58749583081.pdfIn PDF document text
- https://groupunsur3.com/contents/files/21694527503.pdfIn PDF document text
- http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zagusewo.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_off0000d192.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD192	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e9a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9A9	10324 bytes
SHA-256: `a175242af0470d6c7d9ba54a443144894d84a137431a8803b391b3646212939c`
`font_02_sfnt_off00010126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10126	18008 bytes
SHA-256: `446973d87033d3f489a9534688ed826815ad0ef0a8c5531e0c56f0092e853f55`

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