PDF malware analysis — malicious · 20f3bdb9e217f462

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 03:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9660cd04950c59fe3a8bdb2187c0f4b6 SHA-1: d8da4888a988ec49e242f81e5626760b48becf60 SHA-256: 20f3bdb9e217f46205c605c1d391bfa8b13681965df405d5c32a193e837e5894

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, redirecting to various potentially malicious or phishing sites. The PDF structure and embedded content suggest it is designed to lure users into clicking these links, likely for credential harvesting or further malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

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.
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://laborke.ru/uplcv?utm_term=smiley+symbol+copy+and+paste PDF link annotation
- http://pro-group.ru/userfiles/files/9450884139.pdfIn PDF document text
- http://lnyuanzong.com/uploads/files/20210908044447.pdfIn PDF document text
- http://parvazyab.net/basefile/api203/files/lepudebaj.pdfIn PDF document text
- https://siliconautomation.com/userfiles/file/zizogivesonelibowulonus.pdfIn PDF document text
- https://lose-weight.tw/upload/files/ganesaxesik.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc045634---701973447.pdfIn PDF document text
- http://romovi.net/sgi_userfiles/userfiles/files/vikilaperosokuxizinikuxa.pdfIn PDF document text
- https://paidionresearch.com/userfiles/files/7523703912.pdfIn PDF document text
- http://gojjang.com/uploads/files/13211290050.pdfIn PDF document text
- http://flamefitnessstudio.com/cewit/images/file/medad.pdfIn PDF document text
- http://zhihepvb.com/upload/ckimg/files/202109102335078563.pdfIn PDF document text
- http://museodegliarazzimarsala.com/userfiles/files/99184607944.pdfIn PDF document text
- http://bachova-terapia.sk/images/file/danipisewen.pdfIn PDF document text
- http://lor-rostov.su/userfiles/files/97248470098.pdfIn PDF document text
- http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/81869455462.pdfIn PDF document text
- http://closehorses.com/userfiles/file/8471802541.pdfIn PDF document text
- http://agisma.ru/files/pages/files/vegefifefovu.pdfIn PDF document text
- http://vasset.bg/userfiles/file/zavafinevidugumo.pdfIn PDF document text
- http://decoworld.in/dayafter/uploadimages/newsimages/file/pomewuxenu.pdfIn PDF document text
- https://littleedupark.com/ckfinder/userfiles/files/tosirixapigaseta.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_off0000b290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB290	10904 bytes
SHA-256: `9d8e253fe0fc03a0567ce1e1da4c30af43c41735978df89b9b8f84c12c769ed2`
`font_01_sfnt_off0000cb91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e3a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3A3	16896 bytes
SHA-256: `cb84e98c47c938cb82d8aeef1b8cbda05ce08c88831da9442926947de2667be5`

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