PDF malware analysis — malicious · f453331b3fcc4844

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 11:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b4201b674f5319494b9749041d20d5f5 SHA-1: e51485cd168c1eb768b0be496b21279d45a54db2 SHA-256: f453331b3fcc4844a8cecc2cb968730c295915d47d797e33253a8b4e1efa5615

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of URLs are present, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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 https://mokhalasati.com/userfiles/files/14093705149.pdf In PDF document text
- https://sunpower.lv/ckfinder/userfiles/files/wigufizafigukezazoduvum.pdfIn PDF document text
- http://cityclick.it/userfiles/files/88964138225.pdfIn PDF document text
- https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/pupurazepoboliwidaxuzoseg.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/fizefenuzipijiwekiw.pdfIn PDF document text
- https://dongciao.com/uploads/files/202109110053133101.pdfIn PDF document text
- http://ginzaoakland.com/uploads/files/rivoxexuwizukuzakipen.pdfIn PDF document text
- http://sumosushingrill.com/uploads/files/12472798025.pdfIn PDF document text
- http://donkaew-furniture.com/ckfinder/userfiles/files/68839490030.pdfIn PDF document text
- http://prvugkh.ru/uploads/files/fudowivuvuje.pdfIn PDF document text
- http://mottaing.eu/userfiles/files/jakixexufivejikidi.pdfIn PDF document text
- https://nyig.com/files/file/22893591085.pdfIn PDF document text
- https://mmrh.myagenda.cz/pictures/editor/files/punazofemake.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/57425683928.pdfIn PDF document text
- https://foodbiz.bdata.link/upload/files/17601335281.pdfIn PDF document text
- https://casalindasbakery.com/ckfinder/userfiles/files/nedaz.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109030802403352.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d7ab85369f0f726f574836c0d57f4089/72695310418.pdfIn PDF document text
- http://eros-arena.name/eros/userfiles/file/zopevatoposa.pdfIn PDF document text
- http://sobateracota.ro/mm/file/63099417371.pdfIn PDF document text
- http://ydyb.com/filespath/files/20210923194628.pdfIn PDF document text
- https://fitness-sport.it/userfiles/file/godarefo.pdfIn PDF document text
- http://babyshelter.net/assets/upload/files/88912779411.pdfIn PDF document text
- http://bikaji.zohukum.com/ckfinder/userfiles/files/novosuzajazigiwisadu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=long+o+words+listPDF 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_off0000b38d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB38D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cb9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB9F	17356 bytes
SHA-256: `b8031e21ca5d9f59c3db5d6f8d25b948514c2a7bb3329e134d54bb34fc77bbe6`
`font_02_sfnt_off0000f780.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF780	10172 bytes
SHA-256: `01848cd3fd3d1c2f1d0390bfd3326a5e0dc37b0e4c299e1ddf0ddc3788149d29`

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