PDF malware analysis — malicious · af5773b765fa505d

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 07:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: cb8f47073ee4dd726ff975e78205ad02 SHA-1: 5609a877d1f36b46c38862d99fa3c4b24f105dce SHA-256: af5773b765fa505d0f60da16c622d5efd49ce8a0c1fdcb2df7914e1a2633bc5c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts with few links per host, reinforcing the phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://gemma.lucien-sv.info/uploads/files/613147d01f44b.pdf In PDF document text
- http://ekotop.eu/userfiles/file/55125493618.pdfIn PDF document text
- https://hobbes-group.com/upload/files/tetemalamekosogug.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/pupilewunigan.pdfIn PDF document text
- http://snuhonors.com/userfiles/file/xapinuru.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/peah7p1satmq9hkugvn0bl152p/rosiz.pdfIn PDF document text
- https://www.elshandmadedesign.nl/ckfinder/userfiles/files/razebomu.pdfIn PDF document text
- http://kdbelektrotechniek.nl/uploads/file/36382086721.pdfIn PDF document text
- http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46764205350.pdfIn PDF document text
- http://88cpap.com/userfiles/files/bumoniwov.pdfIn PDF document text
- http://decom.pro/admin/ckfinder/userfiles/files/xozejixebavu.pdfIn PDF document text
- http://amuseonline.com/absite/userfiles/file/dufulodox.pdfIn PDF document text
- https://ebooksweb.net/files/file/buxobozuxedizajojixusof.pdfIn PDF document text
- http://zeci.nl/im/image/76451652933.pdfIn PDF document text
- http://arci-mp.fr/admin/File/62086040791.pdfIn PDF document text
- https://northwestconvention.cz/data/files/28149579039.pdfIn PDF document text
- https://t2sc.me/userfiles/50672056108.pdfIn PDF document text
- http://yjeverspeed.com/userfiles/file/40283054445.pdfIn PDF document text
- https://thokhoavietnam.com/upload/files/23980446116.pdfIn PDF document text
- http://fge-service.com/userfiles/file/xokojibas.pdfIn PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/44103142890.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/20394001965.pdfIn PDF document text
- https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/99507692051.pdfIn PDF document text
- http://grubstreet.ca/ckfinder/userfiles/files/josujoz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+12+pro+hotspot+not+workingPDF 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_off0000d5cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5CB	18016 bytes
SHA-256: `35962d10c4dac21a696aa749d29987053cce2529189944a28bb19736245e7e0b`
`font_01_sfnt_off000104c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CDD	10624 bytes
SHA-256: `7522f15c0f8e935a5e2aa77fa3c428305458943663db4c2155c54ec3064a2e91`

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