PDF malware analysis — malicious · c34ea373b9d3aa07

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4d27efc4870acfffd5693f1aa740cd21 SHA-1: 3f6c42cae6700a3fca9a1fbb62d89239571cd83d SHA-256: c34ea373b9d3aa07bb02e812943555ff5701152767540b0db1e44d2781604ed2

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=play+store+app+tv+download PDF link annotation
- http://96rangjai.com/userfiles/file/9937717882.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/files/jefofezaragi.pdfIn PDF document text
- http://embeddedhr.com/ckfinder/userfiles/files/sidijedogemu.pdfIn PDF document text
- http://www.alcera.ca/userfiles/file/66803709835.pdfIn PDF document text
- http://mos-craciun-inchiriere.ro/fckfiles/file/5369336030.pdfIn PDF document text
- https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/laxef.pdfIn PDF document text
- http://tvoirostov.ru/ckfinder/userfiles/files/87350885457.pdfIn PDF document text
- https://actsonics.com/uploads/files/202109100915582038.pdfIn PDF document text
- https://esofagopisa.it/userfiles/file/80307766482.pdfIn PDF document text
- https://digireg.lu/upload/jojamafutaxarudobidabuvap.pdfIn PDF document text
- http://korea-labels.com/ckfinder/userfiles/files/37596335312.pdfIn PDF document text
- http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/13851856363.pdfIn PDF document text
- https://veaodaibrahma.com/uploads/image/files/momivazunezajowide.pdfIn PDF document text
- http://reopen911.info/media/file/1290591726.pdfIn PDF document text
- https://irastuff.com/admin/ckfinder/uploads/files/kakon.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ca70c67c93d6389777d19edf60c0fcc5/fajavedovodirujiwel.pdfIn PDF document text
- http://uptownherndon.com/uploads/files/31573848291.pdfIn PDF document text
- http://bradzo-ep.com/uploads/files/53995017852.pdfIn PDF document text
- https://memo-log.com/userfiles/file/50855861741.pdfIn PDF document text
- http://architettogherardi.eu/userfiles/files/pavinuvojeda.pdfIn PDF document text
- http://iweldbot.com/ckfinder/pho/files/rujofikaduvesuw.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_off0000d7af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7AF	10560 bytes
SHA-256: `0292d5d867cbe8b5be0f9d9b85571bb2f0c0069e84a71d5e4321600454034843`
`font_01_sfnt_off0000f00b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF00B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001081d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1081D	18136 bytes
SHA-256: `69053a3f83ecedd94e1fa3ca2560a81510dcc73eb975d5e73dbbe9fc3af4b75b`

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