PDF malware analysis — malicious · 4b5b02273bd33d44

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: bde870619f260a1ae28b2d374b47e949 SHA-1: 17dc1a37eaaf7faa176f3ac353d4bf085fdb01c2 SHA-256: 4b5b02273bd33d441fecef90b1a8b674b56ee8d8f98edff2cf4438752f6935ee

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, hosting a large number of external URLs, many of which are likely part of a phishing or malware distribution scheme.

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://wang023spa.com/userfiles/202109file/2021091811484570554.pdf In PDF document text
- http://prplus4u.com/ckupload/files/gazidosomulagezobikowu.pdfIn PDF document text
- https://fallahi-sch.com/userfiles/file/rolinilaxewimuzuxilunut.pdfIn PDF document text
- https://visualmotion.nl/uploads/file/69937163291.pdfIn PDF document text
- http://wsp.pl/userfiles/file/medazizawowez.pdfIn PDF document text
- http://nwatchonline.net/userfiles/file/rigapirebivujogononifufuz.pdfIn PDF document text
- https://blnk.eu/userfiles/files/85849342925.pdfIn PDF document text
- http://maginsaatmetal.com/resimlerfiles/29098215654.pdfIn PDF document text
- https://ekransamara.ru/files/51147331620.pdfIn PDF document text
- http://grubstreet.ca/ckfinder/userfiles/files/45565745646.pdfIn PDF document text
- https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/besonukuzifukeluja.pdfIn PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/moxilagaxanomobapibipuz.pdfIn PDF document text
- http://ozkayalartrans.com/userfiles/file/17106455235.pdfIn PDF document text
- http://inica.org/files/file///98406479164.pdfIn PDF document text
- http://chip-chup.hu/upload/file/jiwalonexafudusezuxomanip.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d7e59df3835a424187e331477bed6660/98139718623.pdfIn PDF document text
- http://kppzp.pl/userfiles/file/sezusovinuse.pdfIn PDF document text
- https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312e77c8472---sumupefewu.pdfIn PDF document text
- http://clinicaveterinariasangiacomo.it/userfiles/files/furux.pdfIn PDF document text
- http://popmetre.com/news/files/jugoxelejiwegadozuwe.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109020659113435.pdfIn PDF document text
- http://aec.dbodm.com/js/upload/ckfinder/files/89878480778.pdfIn PDF document text
- https://5ky13lu3-1251.com/contents/files/kudejasazutefegesoguxija.pdfIn PDF document text
- http://kemnhapkhau.com/upload/files/dodas.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hardy+weinberg+equation+example+problemsPDF 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_off0000b1e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1E0	14820 bytes
SHA-256: `b2e6787fa2d877986e5661030a7c1ba50ee25fcd5ae8e33dbf1b19d0ff6e7793`
`font_01_sfnt_off0000d6d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6D4	11416 bytes
SHA-256: `b1115936c2173140fa95a53f3eb17b865cd910073146a3a1ebd46ba5718b48d9`
`font_02_sfnt_off0000f104.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF104	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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