PDF malware analysis — malicious · 13442ddfa1273357

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 8189f4ba1e1fdf441f0d68e4f3ca2081 SHA-1: 5a06f4b22c1dc2e4863eeaa5a1db52886864e9fc SHA-256: 13442ddfa127335755d1770f56229c289d2774dacb94a3a1f84e91d93845b70c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download additional malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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 http://siamintertrade.com/file_media/file_image/file/tijutozi.pdf In PDF document text
- http://safetruck.gr/images/file/54869997371.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021091115270373499.pdfIn PDF document text
- http://inannamsao.com/uploads/files/bujogiwumazujebakukuw.pdfIn PDF document text
- http://www.bongbansaigon.com/uploads/files/32827080013.pdfIn PDF document text
- http://ameshamagazine.com/js/upload/files/femufurowamegugu.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/40415982984.pdfIn PDF document text
- http://7linc.com/uploadfiles/fckeditor/20210901/file/16305007656231.pdfIn PDF document text
- http://a2kat.ru/userfiles/file/voluluwidededokifitake.pdfIn PDF document text
- http://cascad-trans.ru/files/nawewedunuxelatimiwubufo.pdfIn PDF document text
- http://iucecb.com/files/file/25080062646.pdfIn PDF document text
- http://stainless-faucet.com/uploads/htmlupload/files/jegupam.pdfIn PDF document text
- https://inunekocp.jp/mailmagazine/upload/files/89852531716.pdfIn PDF document text
- http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021914929432864.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139a44b2802d---dufegimu.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/jobufuluja.pdfIn PDF document text
- http://pzhjintai.com/upload/files/40961752316.pdfIn PDF document text
- https://sportsslife.net/upload/ckfinder/files/roninapapojubamuruz.pdfIn PDF document text
- http://kondicionery-elektrostal.ru/upload_picture/file/semuvusewuke.pdfIn PDF document text
- https://classykitchen.pl/web/uploads/files/valijuxadirezinogukok.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d59628f4503525bd03928a1638116dfa/70150729743.pdfIn PDF document text
- https://equinox-e.com/upload/UserFiles/file/xawokogasotoluz.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/88163334008.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jojo%27s+fashion+show+4+free+download+for+androidPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bd62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD62	10672 bytes
SHA-256: `c62c19a4662cc79dba889e911c42cdbb63395437b2215afeb45cf68072ef0b84`
`font_01_sfnt_off0000d5e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5E0	18888 bytes
SHA-256: `8d3fa24f52766d619c2cf4e7a981a45cdc9ed177ac89319bed2a66c19dfaa255`
`font_02_sfnt_off00010702.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10702	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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