PDF malware analysis — malicious · 635ec672e2b7416e

MALICIOUS

PDF

81.2 KB Created: 2021-03-19 06:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 690be18e06027b88bdb5e373ccc53d87 SHA-1: 27975121ea2b8e5a069c9ab40464b37e9f31ecbe SHA-256: 635ec672e2b7416eb2a3b15f2fac7ebdfa06d5e0cfb1fd93b659607444ad47f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://resalured.ru/strik?utm_term=gross+motor+activities+for+18-24+months', suggests a potential phishing or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and the presence of external links indicate a malicious intent, likely to redirect users to malicious websites or to host further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://resalured.ru/strik?utm_term=gross+motor+activities+for+18-24+months PDF link annotation
- https://piledefek.weebly.com/uploads/1/3/5/9/135966078/0d8020f7c1f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4415081/normal_5fc717d5ad3b0.pdfIn PDF document text
- https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/tajiw.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393208/normal_5fd16f68f0264.pdfIn PDF document text
- https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/divudodinod_mabadid_filev.pdfIn PDF document text
- https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/webatalupabosus_varupemi_vodonutaduza.pdfIn PDF document text
- https://gazuxajolitivik.weebly.com/uploads/1/3/4/7/134770387/napadi-vobifemowadasi-fesuxo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493227/normal_6043b10238032.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_5e7b9f5facf046d9a28f95c570363071.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/6b915776-e084-4e59-bbcc-7cb38bd8e43f/duvomenuviresarozil.pdfIn PDF document text
- https://s3.amazonaws.com/firigugixujotov/d-link_dcs-5222l_firmware_update.pdfIn PDF document text
- https://s3.amazonaws.com/tubupejevomo/risk_aversion_definition.pdfIn PDF document text
- https://s3.amazonaws.com/wapabefizosumi/audio_editing_software_free_for_mobile.pdfIn PDF document text
- https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_528a506bb5cb4205884ac519fbec77d7.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/7de3cf7d-7a7f-4496-9f46-f11cfa0c34c9/winchester_model_1400_12_gauge_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/13daeab2-810c-48ae-a1de-bbd03532d650/vamuzugegagonuwopidojo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a5c9c49d-c2df-4b69-b427-224043848e70/pejafenoxovigufutevusiwuz.pdfIn PDF document text
- https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_a552a0305f484d86baf411d32bd193b9.pdf?index=trueIn PDF document text
- https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_f3a2ef79dd694467b639b2c03e9baf62.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zerepuzuze/pilapazoroxonowa.pdfIn PDF document text
- https://s3.amazonaws.com/kifutizijebuj/geometric_transformations_foldable.pdfIn PDF document text
- https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_1aef2b80d58e45f286341edb4af953a9.pdf?index=trueIn 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_off0000f008.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF008	5676 bytes
SHA-256: `efd0659b3def5fde4fd61fdcde7ea5b17e9f08674e7d140a0199e9a57be7de1f`
`font_01_sfnt_off00010337.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10337	1800 bytes
SHA-256: `daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e`
`font_02_sfnt_off00010bc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BC5	11932 bytes
SHA-256: `4243043d59a22ca832f3a9ae161ed18eb0498909511f1eb481dddd0b65efae8b`

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