PDF malware analysis — malicious · c5fe5320c5f1b3df

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 16:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 36bb7c4620fd5ba7cb3b6768ebe697f2 SHA-1: 13aeea7cf34794a95b36c3d7dd51165214d56136 SHA-256: c5fe5320c5f1b3df31cbe6f07e0a28ad9891afbd2614c73e062aa8db15ec77d3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://coretry.ru/uplcv?utm_term=gangstar+new+orleans+hack+2020 PDF link annotation
- http://cansuyu.org/resimler/files/31261565135.pdfIn PDF document text
- http://kronospan-mofa-hungary.hu/editor_up/77968419570.pdfIn PDF document text
- https://gabinetpro.pl/kosmetyczka/krakow/files/36031623777.pdfIn PDF document text
- http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45162350602.pdfIn PDF document text
- http://c-six.it/userfiles/files/62288784499.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/nirusotila.pdfIn PDF document text
- http://bernardthevenet.fr/ckfinder/userfiles/files/gukovarovinazutukud.pdfIn PDF document text
- http://charolais-hessen.de/write/userfiles/file/pusezikinejuganajit.pdfIn PDF document text
- http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rexofonoberelos.pdfIn PDF document text
- http://cck-brno.cz/ckfinder/userfiles/files/tonexub.pdfIn PDF document text
- https://matratva.in/userfiles/file/vozawe.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///75447272835.pdfIn PDF document text
- https://austarpharma.com/upload/files/xedor.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/73951411082.pdfIn PDF document text
- http://liga-stf.ru/i/upload/files/jedenamibotonuwazesawoda.pdfIn PDF document text
- http://surmounttravel.com/userfiles/files/41727762916.pdfIn PDF document text
- http://faw-asia.com/image/upload/files/70905844829.pdfIn PDF document text
- http://andlupa.com/userfiles/file/3587005238.pdfIn PDF document text
- http://konditsionery-odincovo.ru/upload_picture/file/piwipe.pdfIn PDF document text
- https://nilsahost.com/calisma2/files/uploads/vilidusoratovukegex.pdfIn PDF document text
- https://doina.md/fckeditorfiles/file/beliranoz.pdfIn PDF document text
- http://a2hgghk.handylover.com/upload/files/kajosamawox.pdfIn PDF document text
- https://jamuiboe.com/webroot/upload_media/43175994162.pdfIn PDF document text
- http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/lujuzunadirijawimokidesof.pdfIn PDF document text
- https://ourcampuswindow.com/ckfinder/userfiles/files/76286473543.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_off0000de80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE80	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f697.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF697	10876 bytes
SHA-256: `ade98300862d693e5207c4def405961ea47871ff5547af72b5b01c4847d097eb`
`font_02_sfnt_off00010fe3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FE3	17964 bytes
SHA-256: `ec8534ead06e394c8b791d4bdc73c3ba25d4835c6709b38a014b0fd50db5c77d`

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