PDF malware analysis — malicious · b1e8531c5756a866

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 06:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 549a9af87a99398cd7922400ae790545 SHA-1: 7af828a8c2a9c85aad31684172b40615efa243c6 SHA-256: b1e8531c5756a8660a78e7c1a842e0cc4f938a80a34c80b72b9da5a57dd33371

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one pointing to 'smidgel.ru' with a 'pokemon silver and gold download' UTM term, suggesting a lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=pokemon+silver+and+gold+download PDF link annotation
- http://serdceprirody.ru/userfiles/file/zuxubomojazofufozolisufuj.pdfIn PDF document text
- http://novastal.pl/userfiles/file/lufopejunaba.pdfIn PDF document text
- http://africareview.in/userfiles/file/58568866812.pdfIn PDF document text
- http://makassitools.com/userfiles/file///vopozukupebibotu.pdfIn PDF document text
- http://studioscoponi.eu/userfiles/files/jiwow.pdfIn PDF document text
- https://bunyaminerdemir.com/resimler/files/27541162592.pdfIn PDF document text
- https://tktravelkorea.com/FileData/ckfinder/files/20210911_39FB7BF65E5F1000.pdfIn PDF document text
- http://sdds.be/userfiles/file/50378615981.pdfIn PDF document text
- http://casaatlantida.com/userfiles/file///vevajanegonogejonu.pdfIn PDF document text
- https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/rekulitaviturisiji.pdfIn PDF document text
- http://leinerpakgelatine.com/survey/userfiles/files/roxag.pdfIn PDF document text
- https://hetodon.com/fckeditorfiles/file/1549556868.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/94099676449.pdfIn PDF document text
- http://synthecinter.com/userfiles/files/31609813314.pdfIn PDF document text
- http://bonezi.morefriendship.com/upload/files/99851220826.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135278d03f73---45881002526.pdfIn PDF document text
- https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/75377330301.pdfIn PDF document text
- http://crocepadrekolbe.it/userfiles/files/16609545058.pdfIn PDF document text
- http://titibbs.xyz/js/ckfinder/userfiles/files/47100470823.pdfIn PDF document text
- https://estatecambodia.com/htdocs/cljr/data/files/kiwek.pdfIn PDF document text
- https://marblobath.com/app/webroot/img/files/pifelokusut.pdfIn PDF document text
- http://ytlcases.com/userfiles/file/98047118026.pdfIn PDF document text
- https://jancsoalapitvany.hu/ckfinder/userfiles/files/rebigenupumukivomib.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_off0000d647.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD647	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE5E	10736 bytes
SHA-256: `30caf39508e4a0a77c5b585b3cd1aeb53a26f3b6c7a97ca1fb5c18c740e4d24f`
`font_02_sfnt_off000106d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106D4	16740 bytes
SHA-256: `62ea4c4cb9714f6295f651ce030d6d517501a949117632d2a4c75daa3dc950fd`

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