PDF malware analysis — malicious · 7d86811d7ad0dfc4

MALICIOUS

PDF

72.1 KB Created: 2021-10-08 01:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 6c35450dc6346524a692228b5a489deb SHA-1: 459426d131d1d5a212b06cb3cfe9daa60ed6f5cf SHA-256: 7d86811d7ad0dfc4597f6cd20983c34ecaa773edef59546a4adb7c48e1ac2d22

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing multiple external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of numerous URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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.
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://nomylo.ru/uplcv?utm_term=authors+contribution+statement+example PDF link annotation
- http://ettorebelfioreliutaio.it/userfiles/files/5879765465.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/30406509171.pdfIn PDF document text
- http://elskup.pl/images/assets/file/gajul.pdfIn PDF document text
- https://lanegarrett.net/userfiles/file/79348706617.pdfIn PDF document text
- https://simondaulte.com/ckfinder/userfiles/files/mosigalafubima.pdfIn PDF document text
- http://ranjoysarkar.in/FCKeditor/file/58414333956.pdfIn PDF document text
- http://officinedesign.it/userfiles/files/zegexozozufexasolimo.pdfIn PDF document text
- http://celeb.huh.hu/UserFiles/File/20647171573.pdfIn PDF document text
- http://giaydantuongphongngudep.com/images/news/file/nulidolopel.pdfIn PDF document text
- https://millinerandassoc.com/files/file/22739379748.pdfIn PDF document text
- https://batikatravels.com/userfiles/file/lowogepesasuku.pdfIn PDF document text
- http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///86713764198.pdfIn PDF document text
- http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suninosegamu.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/16172220581.pdfIn PDF document text
- https://maintogelonline2.com/contents/files/59126859618.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42ca85ed---lugix.pdfIn PDF document text
- https://ntc-container.com/upload/files/vulimisitab.pdfIn PDF document text
- https://www.indoorclub-informa.com/boletines/img/file/tatukutokimotexuva.pdfIn PDF document text
- http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/97700624191.pdfIn PDF document text
- http://ominocoibaffi.it/userfiles/files/pemanadejobapul.pdfIn PDF document text
- https://www.andreivieru.com/ckfinder/userfiles/files/fagivaxaveja.pdfIn PDF document text
- http://avvocato-callegaro.it/public/file/63627282481.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_off0000b601.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB601	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ce13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE13	17284 bytes
SHA-256: `867f13c39ff435a2b49802bf5a0aef86d771a3d03cad92210da6a082bcce95b1`
`font_02_sfnt_off0000fa05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA05	10960 bytes
SHA-256: `539e3b9612bcb95d87f5642ef343b144841c0252af5824493c4ab60e92c08393`

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