PDF malware analysis — malicious · a4500a157201b1ed

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: fc51e51b9a7b75962d680f319155c582 SHA-1: e3d17fd3273d93662d79a99a2bea8b33adabc913 SHA-256: a4500a157201b1ed5f4e8cd267273f826cc00d7b8b19027b3fd80d39217d95be

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely serves to redirect the user to one of the numerous external URLs, which are structured to appear as document downloads, suggesting a phishing or malware distribution attempt. The presence of many links and disposable hosting points towards a link farm used for obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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=belly+aching+laughter PDF link annotation
- http://huijingweb.com/upload_fck/file/2021-7-20/20210720034856826775.pdfIn PDF document text
- https://jdrum-music.com/uploads/ckfiles/files/feduzekarezazakip.pdfIn PDF document text
- http://mayinluatudong.com/uploads/userfiles/file/jafojogej.pdfIn PDF document text
- http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/67048907168.pdfIn PDF document text
- http://dancedynamicsla.com/clients/38740/File/zumugifibufexutivobog.pdfIn PDF document text
- http://szymonadamczyk.pl/uploads/fck/file/48380584773.pdfIn PDF document text
- http://dlikefulproductions.com/clients/875850/File/donisugi.pdfIn PDF document text
- https://ceccargiurgiu.ro/userfiles/file/74681338004.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9da61d3304fd8fd580ff0cdd5257dd07/resixikimeraj.pdfIn PDF document text
- http://auto-spec.ca/fck/file/kapijiji.pdfIn PDF document text
- http://lagostena.it/userfiles/files/pekabasuwufaxerepusodon.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/mabuxoreredepaladokabop.pdfIn PDF document text
- http://sochisushi.nl/survey/userfiles/files/vowenidekulap.pdfIn PDF document text
- http://m2m2design.com/userfiles/luxelilatuxofijo.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/17510372468.pdfIn PDF document text
- http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/72151648438.pdfIn PDF document text
- https://kontiko.com/ktkweb3/images/upload/files/tituwuzatawujojofej.pdfIn PDF document text
- http://paliukenas.lt/i/File/lulubebadodutoxuxaketovo.pdfIn PDF document text
- https://maria-galland.ru/files/file/15802842168.pdfIn PDF document text
- https://ntct-dz.com/ckfinder/userfiles/files/11673725424.pdfIn PDF document text
- https://aparcaderoshaddaichile.cl/uploads/images/files/zoterubojapaz.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c459a51ca70---putisusolizaladomirer.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_off0000d03f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD03F	17532 bytes
SHA-256: `61d09db5d481afbd25145a3a0454b08e1feb78b5b25e24d2bcc7d67374c6b533`
`font_01_sfnt_off0000fd5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD5C	10488 bytes
SHA-256: `eaf0b8a1b2719eb513df8d2d5ceb171905947ac4d1a129284a6aa06a3dfb926b`
`font_02_sfnt_off0001152c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1152C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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