PDF malware analysis — malicious · d3499755d56aac83

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 02:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: ac72d6458b4a25e1aa2d7e0df094f767 SHA-1: 1b0f281934ad1ebd690f28c614c0279edd7d9c62 SHA-256: d3499755d56aac8384b4dc1e9c315eb7127975cf474434fda9357f6d060db640

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using numerous links on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=ice+shard+mm2+value PDF link annotation
- https://alternativecarrepair.com/userfiles/file/nemifiruwariwo.pdfIn PDF document text
- http://homeopathyhongkong.org/files/98268550791.pdfIn PDF document text
- http://desiaussies.com/ckeditor/uploads/files/tipasegatemat.pdfIn PDF document text
- http://wedding-box100.com/uploads/files/202109241635135592.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0f5d787d8---3575962810.pdfIn PDF document text
- https://esperanzadeavila.com/fotos/file/25701751107.pdfIn PDF document text
- https://mytopics.it/uploads/file/tufubupebazisefusat.pdfIn PDF document text
- https://merohamro.com/ckfinder/userfiles/files/xajivusidoponetemafe.pdfIn PDF document text
- https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/66641552902.pdfIn PDF document text
- http://idcla.net/upload/files/16701403199.pdfIn PDF document text
- http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/62583152214.pdfIn PDF document text
- https://dondepodemosir.com/userfiles/file/zipup.pdfIn PDF document text
- http://gibisch.com/files/files/tonoda.pdfIn PDF document text
- https://ywint.com/ckfinder/userfiles/files/1631869574.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/33924401030.pdfIn PDF document text
- https://vinatech.com/userfiles/file/tozekuvimugumujiwip.pdfIn PDF document text
- http://skene.es/userfiles/file/sabavalagazu.pdfIn PDF document text
- https://economiadecomunion.net/ckfinder/userfiles/files/4409521473.pdfIn PDF document text
- http://zulassungsdienst4you.de/bilder/file/90660683744.pdfIn PDF document text
- http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xuwudexulolivisagip.pdfIn PDF document text
- http://videotour24.com/data/fckupload/file/73680486487.pdfIn PDF document text
- https://tworaise.com/userfiles/file/zukarikopowizudirasonakur.pdfIn PDF document text
- https://honkakuji.jp/honkakuji/images/ckfinder/files/nerifavowizovumite.pdfIn PDF document text
- http://wahluenfty.com/userfiles/zadewibewan.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_off0000baf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAF1	10456 bytes
SHA-256: `315a7dbca2220db78390c40a5747d364b73e717c8ca4fed452003081554e0f87`
`font_01_sfnt_off0000d2c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2C6	20384 bytes
SHA-256: `45a91d86b74334e185cdde811e10d15efcdbc6b8d7e76cc35ad40b899e377803`
`font_02_sfnt_off00010766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10766	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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