PDF malware analysis — malicious · 6a9b0d13640dc194

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 08:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 58d56b632ab8d6419c11abb4b8fd92f0 SHA-1: 36f73279a4a51d859deba2bb45f153a1714da026 SHA-256: 6a9b0d13640dc1947c6c2947d8786e8bf869a00bfd1b4426845039e49c56de28

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URIs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, indicates potential for exploitation and execution of further malicious actions. The primary goal appears to be directing users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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
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://sinice-rasy.cz/files/file/metepuvuguzava.pdf In PDF document text
- http://liccuza.ro/stiri_files/file/kimulusiboxesukesofas.pdfIn PDF document text
- http://kaymccarthy.com/immagini/file/27946731077.pdfIn PDF document text
- http://protok.pro/upload/files/ligesebilati.pdfIn PDF document text
- http://eldmsh1.ru/js/ckfinder/userfiles/files/84683395941.pdfIn PDF document text
- https://partetesal.ir/data/file/23568974084.pdfIn PDF document text
- https://callmarkinvestments.fortunekenya.com/callmark/files/66752389066.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1b6923ba9285acc6a5f046bac893abfc/piras.pdfIn PDF document text
- http://turinimoti.com/assets/userfiles/file/88024378318.pdfIn PDF document text
- http://geostudio.eu/userfiles/files/26056987529.pdfIn PDF document text
- http://ormansagszive.hu/upload/file/nutoratunobenotovoba.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161375a1ae40cd---vogofiporifiduj.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/24599198741.pdfIn PDF document text
- http://rulife.ru/ckfinder/userfiles/files/vanerire.pdfIn PDF document text
- https://xn--interpeas-r6a.es/upload/files/luxugagutotofoxog.pdfIn PDF document text
- http://newgoodluckcrane.com/admin/uploadfiles/file/rijotu.pdfIn PDF document text
- https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/60566794032.pdfIn PDF document text
- http://xn----otbbfbbknchz.xn--p1ai/sadm_files/15846092164.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/77915175960.pdfIn PDF document text
- http://rdmsrl.it/userfiles/files/lerajitajudagesafavamo.pdfIn PDF document text
- https://gesema.com/UserFiles/file/dixedekasumi.pdfIn PDF document text
- http://consulcongress.it/uploads/assets/file/53723126145.pdfIn PDF document text
- https://stepweystudy.com/ckfinder/userfiles/files/rebidudulo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=3+consonant+clusters+listPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b5ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5AD	19232 bytes
SHA-256: `196271bbf144433299528af1507ac921bc615c89908766dea87905c136b6ccd4`
`font_01_sfnt_off0000e778.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE778	2064 bytes
SHA-256: `5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832`
`font_02_sfnt_off0000f0b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000108ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108CE	10400 bytes
SHA-256: `af8e0ea67d79830d7a531801f3a77c54742d0f9196e77ce408e8f6cc8c2bc014`

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