PDF malware analysis — malicious · 4bd3db5a4ff87612

MALICIOUS

PDF

81.2 KB Created: 2021-05-20 03:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 9081550bf9f2454549bbb2bff2519d3c SHA-1: 51f5fe291543d2d890dffccef58575132599a44b SHA-256: 4bd3db5a4ff87612312a2404b98188a4ba32b7c6387979d86b576ad4d3cd4ed5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF link farm', suggesting a phishing or spamming intent. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

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://fokemale.ru/strik?utm_term=what+are+the+factors+affecting+conformity PDF link annotation
- https://cdn-cms.f-static.net/uploads/4498971/normal_601d84b2af94e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417032/normal_603864c173c89.pdfIn PDF document text
- https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/podot.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452161/normal_600b4e62bfcc1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4443624/normal_5fe340ad149ca.pdfIn PDF document text
- https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/7573a290705a255.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384851/normal_6010adb19eaf2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373757/normal_6058a8efa4207.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390095/normal_6037f55862bca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450356/normal_6001a6b38e6fe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403260/normal_5fd108f9aa242.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://uploads.strikinglycdn.com/files/d3daf6a3-859d-4212-a8a8-9c9b02bfd77a/92824378918.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/04053b12-bf23-41e8-9956-0156189d5b79/are_engineers_smarter.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1072aa90-ff46-4da0-bcc2-4d8ca87a2a58/ver_pelicula_cazadores_de_sombras_ciudad_de_hueso_online_latino.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5d59b11a-1bc4-4bdd-8868-b909b5846c4d/81371095465.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/03d3d03a-aa90-4e43-abbe-e4ac455a5814/xukopivutarivipudarudakog.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/af3a0b3c-f39d-42c1-9f61-d45bbea0d79b/jarewam.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/77caf948-6b5d-4d66-893e-73510e7d05ce/65722474931.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bc3236de-7ea9-4067-9eb9-39d7562c3e31/list_of_antagonist_and_agonist_muscle_pairs.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7c38a833-72af-404d-b04f-cfbac6177a42/sojelinepezatal.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/942fc475-467e-417a-b583-c74518223185/how_to_start_a_presentation_speech_in_office.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b954985c-ca7d-4be2-b902-ee6ecb1c8f06/78689556300.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_off0000f4c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C9	5164 bytes
SHA-256: `b69c9a7dd5365c8e6e04343e6e103ab078cacb03de47f0c3b1b4c910756afe33`
`font_01_sfnt_off00010639.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10639	10296 bytes
SHA-256: `71564c5f9a94655470f67303cccf881b49760084aea5ecf25ee8b8f585afe6e8`
`font_02_sfnt_off00012963.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12963	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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