PDF malware analysis — malicious · 96feea4c8c39c2db

MALICIOUS

PDF

69.8 KB Created: 2021-10-09 15:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: ae08c79be98a5b690df9bcebeb8f695d SHA-1: f0803c7dbced905e721e08d723c617e6c88ce913 SHA-256: 96feea4c8c39c2db02eaeff5bd5d270b01a0543da7a71e5acb93bd784dfc1c77

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it is a PDF with random and disposable URLs. The PDF contains numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://smidgel.ru/uplcv?utm_term=verb+form+of+hatred PDF link annotation
- http://helder-effect.nl/userfiles/file/35131109786.pdfIn PDF document text
- http://energy-labels.nl/userfiles/file/lenugafuwisojolufoligiti.pdfIn PDF document text
- http://xn--j1aii.su/userfiles/file/rerebewifepugevimadisev.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///8119750305.pdfIn PDF document text
- http://mdknoodles.co/uploads/files/56861789494.pdfIn PDF document text
- http://tuttotop.com/userfiles/files/10433283729.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/tudipowojo.pdfIn PDF document text
- http://dent-pro.cz/pic/file/nukumeburupotesexop.pdfIn PDF document text
- https://internationallanguagenavigators.com/media/61672219577.pdfIn PDF document text
- https://playindiano1.in/ckfinder/userfiles/files/farisubazusomig.pdfIn PDF document text
- https://voxel-avocats.fr/uploads/file/In PDF document text
- https://supzg.ch/userfiles/files/9731683281.pdfIn PDF document text
- http://chinhsuasolieu.com/media/files/bozorivirapimitides.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/46939812324.pdfIn PDF document text
- http://desushibar.com/userfiles/file/82119892214.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/favanovubinawaleri.pdfIn PDF document text
- http://year-c.com/upload_fck/file/2021-9-17/20210917101531279518.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/8602103572.pdfIn PDF document text
- http://4seasonstours.in/userfiles/file/boteleranun.pdfIn PDF document text
- http://sbs-group.co/userfiles/files/mopomufarugowafozuwutuwiw.pdfIn PDF document text
- http://delannahotel.com/user_img/file/90744662832.pdfIn PDF document text
- https://tonmathunglan.vn/upload/files/xugemimobigozaxopasat.pdfIn PDF document text
- http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/79323060907.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_off0000afbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFBE	10316 bytes
SHA-256: `fcd61c9b9f4c0b0b3420216c2a672ef4fe921d3348112b075bd15d7c68503368`
`font_01_sfnt_off0000c6fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6FE	16728 bytes
SHA-256: `282b0baac7b8a8e76d371968c3fc7c7270433ecec7b31efa1159eba76e338a32`
`font_02_sfnt_off0000f1f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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