PDF malware analysis — malicious · bd9cfb8844518359

MALICIOUS

PDF

125.1 KB Created: 2021-03-23 12:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 65739e9ca98a050d47db365d1ac43f84 SHA-1: c3a0896e150b3b2eaa395bc4c7d8fa295369455e SHA-256: bd9cfb8844518359ede43044c467412dcc9d73c4e8f53c7bd1b886bc59973714

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a worksheet, which is a common pretext for malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wix?keyword=polynomial+operations+worksheet+algebra+2 PDF link annotation
- http://tatemegedes.sportsontheweb.net/cattiva_condotta_libro.pdfIn PDF document text
- https://cdn.sqhk.co/bikakigiben/GggggLf/20044855268.pdfIn PDF document text
- https://cdn.sqhk.co/pejinijew/oazQiji/winner_of_cash_days_street_outlaws.pdfIn PDF document text
- http://jisetatiloro.scienceontheweb.net/nikon_coolpix_p520_charging.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366040/normal_601bae2b18844.pdfIn PDF document text
- http://kogowetek.getenjoyment.net/water_billing_system_project_in_php.pdfIn PDF document text
- http://gusevoxuzuwelap.mywebcommunity.org/vixuwatajimuvofukisak.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462678/normal_600da049d63bf.pdfIn PDF document text
- https://cdn.sqhk.co/kuxixixixi/g20jcNm/daxajetumikem.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423460/normal_603324bc4e979.pdfIn PDF document text
- https://cdn.sqhk.co/fukonovum/AgfnjjD/56586003342.pdfIn PDF document text
- https://cdn.sqhk.co/paparidew/jiSPw6Z/how_to_disable_parental_approval_for_apps.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446275/normal_5fe743e3bd987.pdfIn PDF document text
- http://xikisavi.scienceontheweb.net/dutav.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404497/normal_6037a6cef2dcc.pdfIn PDF document text
- http://mezogevap.mypressonline.com/thiruvalluvar_university_b._com_syllabus_2020.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472774/normal_5fe876bf8f279.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387040/normal_5fdfce36b357d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/dozore/brother_hl_2140_toner_change.pdfIn PDF document text
- http://livirava.atwebpages.com/what_is_the_most_powerful_tarot_deck.pdfIn PDF document text
- http://supuwevul.atwebpages.com/schengen_visa_application_formfiller.pdfIn PDF document text
- https://s3.amazonaws.com/vunizi/anti_malware_for_rooted_android.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://scripts.sil.org/OFLIn PDF document text
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00018c35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C35	3080 bytes
SHA-256: `8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b`
`font_01_sfnt_off0001973d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1973D	5764 bytes
SHA-256: `b065c6a86e3c729836c20394f03eb066c9c9e6f669e65b7d7db257c0d4d447f2`
`font_02_sfnt_off0001aa8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AA8D	6340 bytes
SHA-256: `9159c3bbe4e617fc6ab21800076b31c718e0e83db4142b903295bba04c9b58a9`
`font_03_sfnt_off0001ba21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BA21	12856 bytes
SHA-256: `5cd9541d2ecddf1be0b01fd0f13c11abd7462cb22a17924cc5b886de496c066a`

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