PDF malware analysis — malicious · 1bd55c598659e725

MALICIOUS

PDF

95.5 KB Created: 2021-09-15 11:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 1d46013e7ea0c6bf4e70e07a291af049 SHA-1: 8d7d61c9df74b49e27a33375d2c6545803c8db98 SHA-256: 1bd55c598659e72510a11f26af3935e0d850b315e4920c9a9ec1bf6e87ecc373

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. One URL, 'https://smidgel.ru/uplcv?utm_term=apk+followers+instagram+free', suggests a potential lure related to social media engagement, possibly to drive traffic or distribute further malware. The presence of multiple disposable hosting links further supports a phishing or spamming operation.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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=apk+followers+instagram+free PDF link annotation
- http://yalcinsezer.com/upload/ckfinder/files/85208765343.pdfIn PDF document text
- http://allseasonsart.com/uploads/fck_uploads/file/2489910529.pdfIn PDF document text
- http://antasboru.com/guvennet/resimlerfiles/94828341862.pdfIn PDF document text
- http://keralastatetailorsassociation.com/userfiles/file/39828686853.pdfIn PDF document text
- https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ritamamisukixomabasefeg.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/kafex.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/zuxusoxunisuvup.pdfIn PDF document text
- http://haithuanphat.com/uploads/files/3022662340.pdfIn PDF document text
- http://makesrealsense.com/ckfinder/userfiles/files/wositogobowe.pdfIn PDF document text
- http://driscollandgibson.com/images/edit_images/file/22317369526.pdfIn PDF document text
- https://badeluxe.com/userfiles/files/57776166515.pdfIn PDF document text
- http://lesen-und-schenken.de/userfiles/files/13960846502.pdfIn PDF document text
- http://eventologia.com/userfiles/files/61519546360.pdfIn PDF document text
- http://rosabaum.de/web/editor/files/vajoxojafagojavi.pdfIn PDF document text
- http://bloemenwinkelindex.nl/images/uploads/30301360067.pdfIn PDF document text
- https://habibitours.com/ckfinder/userfiles/files/67437858748.pdfIn PDF document text
- https://olterus.info/contents/files/zuziges.pdfIn PDF document text
- https://brawlcall.com/ckfinder/userfiles/files/90599576000.pdfIn PDF document text
- http://sweet-sugar.de/images/uploadedimages/file/kezufivomowuxudomiwubov.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jhf3lni8p11apoommu85pto677/16444651409.pdfIn PDF document text
- http://chochosanencino.com/uploads/files/xedinekixiputuzu.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6f907044---79927788893.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_off00010ec8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EC8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000126df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126DF	10860 bytes
SHA-256: `17f9f29e8a8f5507b20ddbcaa62215aee563c71fa713b4c0e900daf2e7dc6e60`
`font_02_sfnt_off00014010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14010	18416 bytes
SHA-256: `6566e3da39071d080ea8b7a86ea3ba26af8e4a8f07421f2cfefd61c2f3973c45`

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