PDF malware analysis — malicious · 32259899de81ab96

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 16:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 8a5d0ec2597c0b5adb377e874562f826 SHA-1: 829934cdd0059430acf55506ae77fd2e764041b6 SHA-256: 32259899de81ab9643e099d3d058a6ebf11f1d1f143e147ff7962043a19bbb7f

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to phishing sites. The document body is heavily obfuscated, but the presence of multiple external URIs and the overall structure suggest a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://kingcraftviet.com/uploads/ckfinder/files/94689187379.pdf In PDF document text
- http://jsjxh.org/filespath/files/20210917085716.pdfIn PDF document text
- http://szyuangang.com/UserFiles/file///tosamagid.pdfIn PDF document text
- http://yongchengtech.com/uploads/files/202109091728046651.pdfIn PDF document text
- http://fpole.ru/sadm_files/kexanodabusizo.pdfIn PDF document text
- http://sintellect.ru/Repository/file/lofufinuvenevog.pdfIn PDF document text
- http://muabannhagiare.net/images/uploads/files/94205129192.pdfIn PDF document text
- https://starfoil-mail.nl/uploads/wysiwyg/nodobepujetenugilu.pdfIn PDF document text
- http://islenapuntos.com/campannas/file/zimunes.pdfIn PDF document text
- https://silverbirdmarketing.com/pages/images/file/somefipafinekosopipa.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09869d211---lanojejo.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630444385.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/moxewulotuxeg.pdfIn PDF document text
- http://pololanna.com/user_img/files/86495783737.pdfIn PDF document text
- https://khogiaydantuonghanquoc.com/images/news/file/77268737247.pdfIn PDF document text
- https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/92928857547.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35ec88b5a---lerij.pdfIn PDF document text
- https://sananselmo.com/wysiwygfiles/file/36238232556.pdfIn PDF document text
- http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/53347427087.pdfIn PDF document text
- http://meditopthailand.com/file/zizizafapevig.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1631484490.pdfIn PDF document text
- http://mutitar.com/user_img/files/64548402177.pdfIn PDF document text
- http://csim.jp/ckeditor/uploads/files/pagiludejomu.pdfIn PDF document text
- https://www.domosystem.gr/ckfinder/userfiles/files/25502645893.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=p4+golden+questsPDF 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_off0000b4c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ccd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCD2	16684 bytes
SHA-256: `f720da249e4616a1146f099951bce516079f00ee2e3651e418de5185ee5f8503`
`font_02_sfnt_off0000f7d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7D0	10396 bytes
SHA-256: `fa9204f60bbe47c7400b3cb2211f8fdbf7cf5f5c5e4b653afa2e862bf7a49657`

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