PDF malware analysis — malicious · de9fa9149bb9ea18

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 14:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 23da2d307c642b13f1cb878e8876140a SHA-1: 4bc5582c693b1ea00d79679e3d09a18782df7384 SHA-256: de9fa9149bb9ea1856ac7d00d49724673667f8ce648cd8084955b95cb90034e9

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to suspicious domains hosting PDF files, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

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.
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 http://liebherr-tr.com/userfiles/file/94106176825.pdf In PDF document text
- http://hodori247.com/uploads/files/luxadoxidabijajefeb.pdfIn PDF document text
- http://aryajob.com/user_upload/file/63521541546.pdfIn PDF document text
- https://edenestates.com/ckfinder/userfiles/files/34007763075.pdfIn PDF document text
- http://sxnqx.org/upload/file/Fl202109102104196664.pdfIn PDF document text
- https://octvads.site/js/ckfinder/userfiles/files/60754751034.pdfIn PDF document text
- https://butagallery.com/userfiles/files/98069107030.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16143e760b1eaa---59394367836.pdfIn PDF document text
- http://ji-tien.com/userfiles/file/bokifugobuwimakedorojunor.pdfIn PDF document text
- https://edinburghpools.com/contents/files/53201369411.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84d09fd26---70735670328.pdfIn PDF document text
- http://zhongguohuachun.com/d/files/jurore.pdfIn PDF document text
- http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/vorini.pdfIn PDF document text
- http://seidels-mineralienwelt.de/images/uploaded/file/zugepigegokepulepo.pdfIn PDF document text
- https://nationalshield-uae.com/userfiles/files/gosakera.pdfIn PDF document text
- http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_14_43_39_9925.pdfIn PDF document text
- https://senesi-sklad.cz/userfiles/file/witokajur.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05857c6a0---ragewazomiganata.pdfIn PDF document text
- http://laiyi-art.com/userfiles/file/83374128613.pdfIn PDF document text
- http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/58869756635.pdfIn PDF document text
- http://ritadas.in/userfiles/file/daguga.pdfIn PDF document text
- https://ijtm.in/userfiles/file/32437599963.pdfIn PDF document text
- http://swatimishra.in/uploaded_files/userfiles/files/gozof.pdfIn PDF document text
- https://idosekotthonaveresegyhaz.hu/files/files/40701740312.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+block+incoming+calls+on+my+phonePDF link annotation
- 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_off0000d61a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD61A	16988 bytes
SHA-256: `2b863ae6d788662a15e7778f175f10019852288ecde341480c1616acd24e2adf`
`font_01_sfnt_off0001022f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1022F	11188 bytes
SHA-256: `bac80ef4e6ac39e52e07f5a98e14f4b3a1ee0a875e227d77c63c4598901babc3`
`font_02_sfnt_off00011bb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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