PDF malware analysis — malicious · bb55405ab168a1dd

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9c8b927ce3595d185218a7b821ddb70f SHA-1: 16660daa5b12739f933068c9b07fd06bb802a4c5 SHA-256: bb55405ab168a1ddf628c3497aa70c5fee438230b0e3340005a7dd8b43584fe1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://crysiq.ru/uplcv?utm_term=the+wiggles+free+download PDF link annotation
- http://helderlive.nl/ckfinder/userfiles/files/xapajideluvezexugo.pdfIn PDF document text
- http://yuanjen.com/ckfinder/userfiles/files/vazolizesa.pdfIn PDF document text
- http://meubelenindex.nl/images/uploads/78235501237.pdfIn PDF document text
- https://woft-dining.com/webroot/editor-uploads/files/48524323530.pdfIn PDF document text
- http://gonvvama.net/filespath/files/20210909022703.pdfIn PDF document text
- https://beldapromosyon.com/calisma2/files/uploads/wugetigozenonodiwakowom.pdfIn PDF document text
- http://murito.fr/ckfinder/userfiles/files/55986108479.pdfIn PDF document text
- http://energy-labels.com/userfiles/file/77099125418.pdfIn PDF document text
- http://superfasttv.com/uploads/files/jenamewemovisivevetafi.pdfIn PDF document text
- http://viviapalermo.com/userfiles/files/nasixoneguwazuma.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ce2a351---20426540290.pdfIn PDF document text
- http://lecostationery.com/files/file/57930091651.pdfIn PDF document text
- http://soojuspilt.ee/files/file/madilarezidanazasokiw.pdfIn PDF document text
- http://lesmashclub.com/imgUpload/files/67799319107.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0575817c---vuritavep.pdfIn PDF document text
- https://morganmethod.com/ci/userfiles/files/87594970252.pdfIn PDF document text
- http://heizler.hu/files/file/nokovugivuxidod.pdfIn PDF document text
- http://www.centrosanmarco.eu/img/news/files/62124263691.pdfIn PDF document text
- https://skinrepublic.vn/webroot/img/files/detam.pdfIn PDF document text
- http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/situjijuwilu.pdfIn PDF document text
- https://investincarpathians.eu/app/webroot/media/files/fafiza.pdfIn PDF document text
- https://atavio.ru/files/file/lomafukovonozit.pdfIn PDF document text
- https://deitratech.com/userfiles/file/gaguviv.pdfIn PDF document text
- http://aptekadc.pl/userfiles/userfile/79263611989.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_off0000d694.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD694	18312 bytes
SHA-256: `996177a0eca9c25d9951c18eac717af91ea739ead1b633ecbecc62d782b65f29`
`font_01_sfnt_off00010658.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10658	10584 bytes
SHA-256: `dcc2dbca896e27e2f2c8e0b9c47ad826e0d215a23094e38b84315c497a78b257`
`font_02_sfnt_off00011e4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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