PDF malware analysis — malicious · 09aed39f436ebca0

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 16:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0d12770d60de6f697187b5aa373822d6 SHA-1: 71dc69fc9eff791d2eb41e7cb55bcd7554236787 SHA-256: 09aed39f436ebca0b403bb8a63e38cc768dff1b0695f7b886a411287d0707ba4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm on disposable hosting. The presence of urgency language further suggests a phishing or social engineering attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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 http://ballarioarchitetti.eu/userfiles/files/54875410368.pdf In PDF document text
- http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/14498320753.pdfIn PDF document text
- http://innotack.com/userfiles/files/37816718449.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/vulikub.pdfIn PDF document text
- http://bakineshr.az/ckfinder/userfiles/files/59647045744.pdfIn PDF document text
- https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/puzofogusulipujodop.pdfIn PDF document text
- http://boki.hu/editor_up/dedap.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/14765316753.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/81852792623.pdfIn PDF document text
- http://sabaparsian.com/ckeditor/files/files/69116797626.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/53394181392.pdfIn PDF document text
- http://hattingtoemrerogsnedker.dk/userfiles/file/19247914813.pdfIn PDF document text
- http://cherryontop.pl/upload/fotki/file/8612720131.pdfIn PDF document text
- https://ringid.vn/ckfinder/userfiles/files/vatovozefopemidivusu.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/20292761222.pdfIn PDF document text
- http://griesvoegwerken.nl/UserFiles/file/111723045.pdfIn PDF document text
- https://isagrinio.gr/userfiles/tilalagarozimag.pdfIn PDF document text
- http://studiobardinisrl.com/userfiles/files/34587578508.pdfIn PDF document text
- http://cpgny.com/userfiles/files/48552418359.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854972e4d---43527997257.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/84738790296.pdfIn PDF document text
- https://snoman.mb.ca/ckfinder/userfiles/files/fozinive.pdfIn PDF document text
- http://wamer.org/userfiles/file/juwepegajobagogivaso.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0d00b464b726f704e45f3bb34499fe15/52611771998.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=duo+screen+recorder+apkPDF 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_off0000e248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE248	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA5F	10464 bytes
SHA-256: `4955d19a267fdad33bf4473c5b50a25b75a1131f10e92593ab4972f68e50694c`
`font_02_sfnt_off00011240.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11240	17832 bytes
SHA-256: `7ae89f030dea782bd1841934bbaf78fb52ca984c115befd34a2072b03911c719`

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