PDF malware analysis — malicious · 4aa7dcc92e7200d5

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 13:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 8d15a14ac145485d01873ee5a3319b2d SHA-1: 607e6b79828b38c8c6ad17608d4ea86397485a79 SHA-256: 4aa7dcc92e7200d57cbeb2ed579571cad2e133c2f06e65ff106c2bba764c8d38

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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
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://coretry.ru/uplcv?utm_term=nevada+unclaimed+property+holder+reporting+manual PDF link annotation
- https://marblobath.com/app/webroot/img/files/punukutapawawiwudiku.pdfIn PDF document text
- http://automyjka.pl/automyjka.pl/userfiles/file/29996703716.pdfIn PDF document text
- http://elvirajogsi.hu/ckfinder/userfiles/files/tebuzufeni.pdfIn PDF document text
- https://xyoaa.org/sites/default/files/files/fajupuropugugewurakef.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132198725408---37192869539.pdfIn PDF document text
- http://www.fred-robin.com/ckfinder/userfiles/files/wuxujas.pdfIn PDF document text
- https://sunsoftinfoway.net/ckfinder/userfiles/files/pupuwibaleteserulodo.pdfIn PDF document text
- https://siemreaptraveltours.com/userfiles/file/toxogoxenawuzarubat.pdfIn PDF document text
- http://fusen-es.info/yamituki-n/uploads/files/jekatokakaxov.pdfIn PDF document text
- https://organicearthfiji.com/documents/file/fazunorozufomufajigoja.pdfIn PDF document text
- https://profitaler.com/UserFiles/file/79666320968.pdfIn PDF document text
- https://rheinfurth.de/userfiles/file/76466545277.pdfIn PDF document text
- http://feynburg-uhren.de/uploads/bimunabaf.pdfIn PDF document text
- http://eis-pieschel.de/UserFiles/File/81492216666.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf4f146b5---2641772004.pdfIn PDF document text
- http://stsmcc.org/www/js/ckfinder/userfiles/files/25659836487.pdfIn PDF document text
- https://www.southdownscellars.co.uk/ckfinder/userfiles/files/50930633231.pdfIn PDF document text
- http://aven.su/userfiles/file/runitajarukogoxam.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/medigeruxivutotu.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324b009e8dc---36512238135.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/sibebisexizuv.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_off0000f111.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF111	11052 bytes
SHA-256: `bdd9c8307d6bae3b9ae5153fd214ee2ece5cb1c3dca83ad16a29da77256632e8`
`font_01_sfnt_off00010a59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001226b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1226B	18544 bytes
SHA-256: `f8305500b1c0ee7ba1e480384a67814d9ee7d2acaf72eb0a269550441f9769e3`

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