PDF malware analysis — malicious · 8270342b8c88726b

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 03:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 76e6dc16cd7d3a80340edb11199fe581 SHA-1: 2c2d4ad10d7819817b7e3a48dda219db5e5e94a8 SHA-256: 8270342b8c88726bf2edc964c73e1df9c6e329b248e4b7b9dba5990fc3898ca0

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 ClamAV and an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, including one pointing to 'chcial.ru' which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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.
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 https://chcial.ru/uplcv?utm_term=battery+diagnostic+app+android PDF link annotation
- http://hytechcommunications.com/userfiles/file/teduwomabotujifeguraju.pdfIn PDF document text
- https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/29362940299.pdfIn PDF document text
- http://bacvietexpress.com/upload/userfiles/files/komuwofoxitaboruz.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/nifavaf.pdfIn PDF document text
- https://inprovitchile.com/ckfinder/userfiles/files/75537085175.pdfIn PDF document text
- http://viral-list-monster.com/ckfinder/userfiles/publics/files/44915833311.pdfIn PDF document text
- http://demirlermetal.com/resimler/files/28672500578.pdfIn PDF document text
- http://dunakeszi.varosom.hu/userfiles/files/89988403007.pdfIn PDF document text
- http://uniradioweb.info/userfiles/file/43437898869.pdfIn PDF document text
- http://stickerbarcode.com/file_media/file_image/file/86653167248.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakadigomuluzeb.pdfIn PDF document text
- https://doina.md/fckeditorfiles/file/jepabum.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb781aa89---98986621154.pdfIn PDF document text
- http://tznjl.com/userfiles/files/puwafonebexofapoxex.pdfIn PDF document text
- http://shrlie.com/upload_fck/file/2021-9-5/20210905120037139497.pdfIn PDF document text
- https://dycmc.com/DATA/upload/files/202109091024102512.pdfIn PDF document text
- http://topup-fight.com/ckfinder/userfiles/files/64226247035.pdfIn PDF document text
- http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.pdfIn PDF document text
- https://palezieux.com/ckfinder/userfiles/files/85029878357.pdfIn PDF document text
- http://lica.plovdivweek.com/js/ckfinder/userfiles/files/67977267239.pdfIn PDF document text
- https://ssvacancy.com/ckfinder/userfiles/files/kugusiranugapinojup.pdfIn PDF document text
- http://kamerton.nl/clientfiles/68198956465.pdfIn PDF document text
- http://cdkuys.handysociality.com/upload/files/10976861619.pdfIn PDF document text
- http://aweibel.com/Photo/file/91812276725.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_off0000c46b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC46B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC82	10812 bytes
SHA-256: `a9fe8063329d6a3f03d5b48cd53c02fadc691bc412e6f8c2066277aaf988aff1`
`font_02_sfnt_off0000f569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF569	16692 bytes
SHA-256: `4fe6b2c273544f1bb22392978e7b6bc4747d936652d8b57bf3b4831bbbcccad0`

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