PDF malware analysis — malicious · 54c5f51dc407a529

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 17:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 092d9c86bfe7c5c051feb20c57f07ec1 SHA-1: e9da4706f53c1ac4555d0fbd4e2fb9862761600a SHA-256: 54c5f51dc407a529988e67fa3e79fa9d8ee583455010a347cef3c9c1c9931d05

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://huntic.ru/uplcv?utm_term=room+database+recyclerview+kotlin PDF link annotation
- https://alstar.uz/images/shared/file/jerotosuvepiposibutofome.pdfIn PDF document text
- http://bloodfaces.de/attachment/file/bamovoti.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613186cc4af64---12010022313.pdfIn PDF document text
- http://xindeshiye.com/uploadfile/file///2021091415232630.pdfIn PDF document text
- http://familie-schiecke.de/images/file/16278496939.pdfIn PDF document text
- http://mastrodibaglio.it/userfiles/files/resupol.pdfIn PDF document text
- http://salamatekhanevadeh.ir/ckeditor/files/files/mozozi.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mkcca1vc36f6osl1gp0j05mao4/bezoropewenepizexid.pdfIn PDF document text
- http://taxfreepoint.com/file/fumarakabej.pdfIn PDF document text
- http://abwjefferson.com/uploads/files/9261020382.pdfIn PDF document text
- https://amatnieks.com/pictures/image/zalukusawavonimarigiwen.pdfIn PDF document text
- http://85560891.com/upfolder/e/files/20210914044519.pdfIn PDF document text
- http://incomingmakedonia.com/files/files/52969911524.pdfIn PDF document text
- https://taiwan-tiaya.com/upload/tiaya_official/files/roxadujenijuxonidujugej.pdfIn PDF document text
- http://abwingsjanaf.com/uploads/files/kurisuba.pdfIn PDF document text
- https://www.agcontraincendios.es/ckfinder/userfiles/files/bubusurujitetixovosibogan.pdfIn PDF document text
- http://chenruichem.com/upload/files/punadurokirumilofuj.pdfIn PDF document text
- http://sysquare.com/UserFiles/files/lujinafitapo.pdfIn PDF document text
- http://www.psoealora.es/ckfinder/userfiles/files/lumiranebeforibasiz.pdfIn PDF document text
- http://usarsenal.it/userfiles/files/zesodofufilase.pdfIn PDF document text
- http://studiocalcinoni.com/userfiles/files/54890953556.pdfIn PDF document text
- http://impex-italia.it/userfiles/files/xuravesegakowetepenin.pdfIn PDF document text
- http://ukrfirework.com/images/file/57025526011.pdfIn PDF document text
- http://hzqzg.com/d/files/2752650427.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/xodazuzokuvodexekamedav.pdfIn PDF document text
- https://istruttorecinofilo.it/userfiles/file/xopufutitobegu.pdfIn PDF document text
- https://mraos.com/web/userfiles/file/basuzejenarimesidanivi.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_off0000c56f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD86	11076 bytes
SHA-256: `1da7ecc3c00756cf451cf9202d09f7a3a5734449b9ccef17bb9b3544e861069b`
`font_02_sfnt_off0000f768.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF768	18144 bytes
SHA-256: `9614800b2e089393e33ed669e943b6fff0542b05ec1ecab7ec17f93ca55e23b5`

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