PDF malware analysis — malicious · c968eb43d2ed2f87

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 11:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7ebac32e9eb05b7339930b6f6b319c7c SHA-1: 59050c05e53ad884c90f7bec46641fa217df63af SHA-256: c968eb43d2ed2f87b9286f27edd6babf4ef960cf483b96b3816fba7638f4f8dd

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of an embedded JavaScript stream further supports the likelihood of malicious activity, potentially for downloading additional payloads or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://crysiq.ru/uplcv?utm_term=bbm+para+android PDF link annotation
- http://fabtur.ru/upload/files/47786349316.pdfIn PDF document text
- http://travelcenterpuntos.com/campannas/file/ruweguforop.pdfIn PDF document text
- https://eletmodguru.hu/files/files/xawobebagivodenajizoji.pdfIn PDF document text
- http://clinicaveterinariacene.com/userfiles/files/97958827272.pdfIn PDF document text
- http://rebeccaosborne.com/uploads/89374353372.pdfIn PDF document text
- http://daehwa.info/uploaded/file/folawi.pdfIn PDF document text
- http://gmart-express.com/demo/uploadpic/file/63641642870.pdfIn PDF document text
- http://awards.nl/img/cms/file/57363719753.pdfIn PDF document text
- https://jetaime-shop.dvsportbg.com/files/vorumojodufokasutitese.pdfIn PDF document text
- https://akapacha.com/userfiles/file/mudemonusudirero.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/jigokemivasibikiluru.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogokalufupa.pdfIn PDF document text
- http://radiosalsa.fr/php/rs/filesupload/file/ramagasivabejale.pdfIn PDF document text
- https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
- http://eqletstalk.com/uploads/files/202109090400348367.pdfIn PDF document text
- http://carbontuning.ru/file/93367336291.pdfIn PDF document text
- http://industrialsupplies.pk/userfiles/files/56548333481.pdfIn PDF document text
- http://narcisse.sk/editor_uploads/files/86897287667.pdfIn PDF document text
- http://espaciocultivarte.com/ckfinder/userfiles/files/nasov.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f643ca7d1528ec5d5d731c128c528b4b/37512898051.pdfIn PDF document text
- http://saint-party.com/media/file/5813948451.pdfIn PDF document text
- http://scales-center.com/shop/fck_file/file/zosojufoferapixix.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_off0000d63b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD63B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE52	10304 bytes
SHA-256: `3e89e8dc9efd1b945f463e37fee990b37982edea4c29c10ed69b6b7bdcb7cee1`
`font_02_sfnt_off00010525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10525	18904 bytes
SHA-256: `b7d0ef6871fdc05aeceb7fbf6db26728948f77e346155d667571ac30754f1ab8`

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