PDF malware analysis — malicious · e6eaa7c3a0f9a6d4

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 13:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7116f2a84f770a4b513b745f2a74019a SHA-1: 70683d7a4ffba319e167fe0fe53074e9aea8aee3 SHA-256: e6eaa7c3a0f9a6d4b58b11e29dd50a4019f23799bec4db10fef09f386fd2eaba

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. Multiple external URLs are embedded, suggesting a potential download or redirection mechanism for further stages of the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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://crewmak.ru/uplcv?utm_term=107+geometry+problems+pdf PDF link annotation
- https://brod-plovdiv.com/images/28560679722.pdfIn PDF document text
- https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/nogazuba.pdfIn PDF document text
- https://equantumconsulting.com/files/files/niranane.pdfIn PDF document text
- http://ordineveterinarivenezia.eu/userfiles/files/fumidilokup.pdfIn PDF document text
- http://cachnhietwin.com/luutru/files/wixetulib.pdfIn PDF document text
- http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sajalabafedo.pdfIn PDF document text
- https://avphunter.ro/ckfinder/userfiles/files/mijetukugogituku.pdfIn PDF document text
- https://ghnservizi.com/file/jalifebani.pdfIn PDF document text
- https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voluvezefega.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f0cd9975a7146d25437b2b187c7b14b2/lesutabowav.pdfIn PDF document text
- http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45006395795.pdfIn PDF document text
- http://lineshare.net/upload/files/20210903030356.pdfIn PDF document text
- http://shiokuda1.com/contents/files/sapetago.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegubeguzezedujupiv.pdfIn PDF document text
- http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
- http://c2ctrading.org/cms_upload/files/84324336940.pdfIn PDF document text
- http://intertribo.sk/files/tuliviralexow.pdfIn PDF document text
- http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
- https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/92651507020.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa7612f92---28870564789.pdfIn PDF document text
- http://skkouty.cz/ckfinder/userfiles/files/59076131297.pdfIn PDF document text
- http://godsownproperties.com/userfiles/file/69860047606.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/sisakavuxeseluvotakezi.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_off0000c5b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ddc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC8	10864 bytes
SHA-256: `df1574711bfd5c175604bb92a4375e17d4019772530e533a0a42ceb855335d8e`
`font_02_sfnt_off0000f685.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF685	18912 bytes
SHA-256: `f745e89dae553f3cc70bdd4ae32ea6819105b38534eab00c91e5c3ba12503c3d`

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