PDF malware analysis — malicious · c4045a4c233e5cc5

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 19:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f7c1e093fcb426f06ce521569cd71ad0 SHA-1: 9c22f40b0875a26e1c9bbaaf8272c7d47d3fffc8 SHA-256: c4045a4c233e5cc516a2a5029100b8bb0d22238400aee36087b8e0c85e211d1e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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://wastran.ru/uplcv?utm_term=coocking+mama+android PDF link annotation
- https://gifarlcm.com/upfiles/editor/files/47162241359.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iorc9u938kjb2jnm97s30bh6sg/vanerovop.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914072109129897.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/53363176268.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/51199076417.pdfIn PDF document text
- http://zhuoxinlaw.com/userfiles/file/20210912110935_1633990637.pdfIn PDF document text
- http://seowonbattery.com/files/fckeditor/file/21003311206140481518bc9.pdfIn PDF document text
- http://yipdeals.com/app/webroot/upload/files/33910771214.pdfIn PDF document text
- http://demkapi.com/resimler/files/77792874244.pdfIn PDF document text
- https://samsungdvmklima.com/upload/ckfinder/files/pifufajimaxo.pdfIn PDF document text
- http://vegman-kzn.com/ckfinder/userfiles/files/kavurulugik.pdfIn PDF document text
- http://dinhvi5s.com/images/newtech/files/618870265.pdfIn PDF document text
- http://jindi2010.com/uploadfile/files/sebozekikazaxuwir.pdfIn PDF document text
- https://skiclubraonbaccarat.fr/pdf/fexifig.pdfIn PDF document text
- http://oskarmak.com/userfiles/file/40048222976.pdfIn PDF document text
- http://nomorecpapmachine.com/userfiles/files/24693519135.pdfIn PDF document text
- http://52fotki.ru/ckfinder/userfiles/files/32903901846.pdfIn PDF document text
- https://marcvandewiele.com/userfiles/file/22642202456.pdfIn PDF document text
- https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/modemivomur.pdfIn PDF document text
- http://dallapietamarchisio.it/userfiles/files/gozabaxerepariwibuj.pdfIn PDF document text
- https://vinasimex.com/uploads/file/devuvejepavete.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293b22436b---73336187568.pdfIn PDF document text
- http://vncdata.net/app/webroot/uploads/files/14333966653.pdfIn PDF document text
- http://avandcie-energy.fr/ckfinder/userfiles/files/18146207161.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_off0000bae0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAE0	10392 bytes
SHA-256: `18b62cd43207b91ceb7a0af5a711248e29ec8e689bb67e656b8bd96e37e07a40`
`font_01_sfnt_off0000d219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD219	16352 bytes
SHA-256: `9c09c88ae8c16bff84111354316359d021997fb4aad4f8972c10b81994a3a1b4`
`font_02_sfnt_off0000e881.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE881	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00010093.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10093	21304 bytes
SHA-256: `47a1b522459ff7546c72887dc12ab681355762a64d31cdddfe69dc0911f31fed`

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