PDF malware analysis — malicious · 35dbf90b2ba9364f

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 12:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: bccf66db6e5860052e607415d3ea6e09 SHA-1: 72199f01ce8fbc4c409e6096c113e12ade1e004e SHA-256: 35dbf90b2ba9364f32119917dda14cf6ebb1d918a1daf4c6893902e34700011d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/123?utm_term=gcse+biology+quiz+with+answers PDF link annotation
- http://stalekost.site/565983494372qsgf.pdfIn PDF document text
- http://gudelew.mywebcommunity.org/fodebebufedawarituvap.pdfIn PDF document text
- http://ketotreno.buzz/66458298509w8tkc.pdfIn PDF document text
- http://hellovendi.com/stalker_shadow_of_chernobyl_free_download_megaf1ctt.pdfIn PDF document text
- http://penafur.scienceontheweb.net/67309060401.pdfIn PDF document text
- http://dirozigumifew.scienceontheweb.net/kigetevowulowowetebexov.pdfIn PDF document text
- http://vvd.bar/alien_zone_plus_hack8uitc.pdfIn PDF document text
- http://xaredazisom.mywebcommunity.org/medication_administration.pdfIn PDF document text
- http://dommasters.site/does_texas_have_cottage_food_laws9zol2.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_ca5e4d4a5ac74ca4bcb889ea3141d151.pdf?index=trueIn PDF document text
- http://nozozuwovore.atwebpages.com/retovevirakoba.pdfIn PDF document text
- http://jofijegisa.atwebpages.com/sodium_fluoride_msds.pdfIn PDF document text
- https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_512b699eb8b341bc8591d328ca9144f1.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bomupi/gajotetokaxosigodigitorex.pdfIn PDF document text
- https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_12bb0e3839c249baa8f29c97611886cd.pdf?index=trueIn PDF document text
- https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_0d57a7a64db5460b995dc2f72ca82e7f.pdf?index=trueIn PDF document text
- http://gakajitaju.atwebpages.com/63132893306.pdfIn PDF document text
- https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_4ed96018bc794b558563e57fe11fb03e.pdf?index=trueIn PDF document text
- http://zejibanunepi.myartsonline.com/wireless_mobile_battery_charger_circuit.pdfIn PDF document text
- https://s3.amazonaws.com/petuzutemixuvod/casio_pathfinder_watch_manual_3134.pdfIn PDF document text
- http://gemovimuwopete.atwebpages.com/nerasizukudojafawisepoto.pdfIn PDF document text
- https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_65d3772a0c634947bfad13ebf7093bfd.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vuxirefare/74957961019.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ebe0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE0	5484 bytes
SHA-256: `e63fe79a943b9a93a9a328517be989628e9b740e5a346287aa5d8fd9d28a70c2`
`font_01_sfnt_off0000fe90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE90	11068 bytes
SHA-256: `06cabbd903b88471207e5af99966b1229953f09dee891de6d2240cc6671c1e5a`
`font_02_sfnt_off00012437.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12437	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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