PDF malware analysis — malicious · f7543947674a19e2

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0788255715b977aca0e6f3605946a91c SHA-1: cbf796eb5a6379fd0c5841119231b0b08489578f SHA-256: f7543947674a19e2edcfc0b809eaac7ada05ef64992d105e0692487c52405bbd

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and numerous links to external PDF files hosted on potentially disposable domains, suggesting an attempt to download and execute further malicious content. The PDF's structure and the presence of external links strongly indicate a spearphishing attachment vector.

Machine Learning

Nyx PDF Classifier suspicious score 0.4237

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
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.
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
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://studioriboldi.eu/userfiles/files/gegajeparofapuke.pdf In PDF document text
- http://ambulatorioveterinariocigliano.com/userfiles/files/nabovuzuzub.pdfIn PDF document text
- http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/2182418794.pdfIn PDF document text
- http://nj-rshb.com/v15/Upload/file/2021910212492575.pdfIn PDF document text
- http://amblesidewindermere.ca/fckuploads/images/file/50735120192.pdfIn PDF document text
- http://aprt1day.ru/file/xumiwuresezonases.pdfIn PDF document text
- http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/30304792554.pdfIn PDF document text
- http://fd-health.com/upload/ckeditor/files/vasakejuzogof.pdfIn PDF document text
- http://vkts.se/userfiles/file/miwuwu.pdfIn PDF document text
- https://nikunjfoundation.org/ckfinder/userfiles/files/2126002898.pdfIn PDF document text
- http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zapofut.pdfIn PDF document text
- http://mayepnuocmia.vn/data/ckfinder/files/jaduvabozizilukixa.pdfIn PDF document text
- https://rmduncanrealty.com/userfiles/files/nenipujaguvuzudenavirimaf.pdfIn PDF document text
- https://maviet.vn/upload/files/ziviru.pdfIn PDF document text
- https://simpangkanan.com/contents/files/3222303531.pdfIn PDF document text
- http://munnartourism.com/uploads/file/xitolawulidofime.pdfIn PDF document text
- https://europartner2.pl/uploads/64567311764.pdfIn PDF document text
- https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/96049497869.pdfIn PDF document text
- http://prodottoitalia.eu/userfiles/files/87059891088.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/petuvezirarubijep.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613810689806c---13282689083.pdfIn PDF document text
- http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/wetebazobenonin.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cara+mematikan+whatsapp+di+androidPDF link annotation
- 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_off0000ceeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEEB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e6fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6FD	17624 bytes
SHA-256: `4e74d06cfa93685a78a0499742c3cd2c735d978697bed0b8afce6404fea81337`
`font_02_sfnt_off00011447.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11447	10820 bytes
SHA-256: `63415cd958d8e65c01d1588f46cf25421244978289858ae0ca209e687a92509b`

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