PDF malware analysis — malicious · 7f2723ed20eec0d4

MALICIOUS

PDF

81.5 KB Created: 2021-03-08 08:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: e4e298499206aea5c71e56b479d4711b SHA-1: a26cd0545437e55e9eec649af29c1b9d617e8570 SHA-256: 7f2723ed20eec0d44804fb27b4b274d1d368c593de73d76bfb1642d9bead8efa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs, one of which points to a suspicious domain ('kuzutuzo.ru') and is flagged as external. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically identifying it as a phishing or trojan. The document body, though heavily obfuscated, contains keywords related to chainsaw carburetor adjustment, suggesting a lure to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=poulan+pro+35cc+chainsaw+carburetor+adjustment PDF link annotation
- http://megatorg.ru/16668278395zxg8.pdfIn PDF document text
- http://tufofol.medianewsonline.com/86314596107.pdfIn PDF document text
- http://webmastervlad.ru/vsp_employee_enrollment_formo754u.pdfIn PDF document text
- http://matcobzor.ru/5308339684023m5r.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://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_c327110f2d7e472a80f1ad163d960826.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/df25e294-0e04-45de-95a6-1b19ddb2f90b/operaciones_combinadas_con_fracciones_ejercicios_para_resolver_secundaria.pdfIn PDF document text
- https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_a877b21a3d584d3394797a2e2c20e9ef.pdf?index=trueIn PDF document text
- http://tivakifuzir.atwebpages.com/xulijiwazatuxijofutepi.pdfIn PDF document text
- http://patuwovoparivi.rf.gd/free_halloween_birthday_templates.pdfIn PDF document text
- https://s3.amazonaws.com/kakef/84055220851.pdfIn PDF document text
- http://megutid.epizy.com/47626632142.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2229271c-23ca-46cc-989e-0b5a75eb3547/78252591211.pdfIn PDF document text
- https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_0f59ef7ac6734e38a4ca7ffc6ad1cc89.pdf?index=trueIn PDF document text
- https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_28d5ba8deacc405eb32097d747fda07e.pdf?index=trueIn PDF document text
- http://mujevevurisul.epizy.com/sisomenisawarazosawe.pdfIn PDF document text
- http://tobikinos.onlinewebshop.net/the_endless_summer_2_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0d1cd90a-5e0e-45fc-b9e0-86ae3e5bd354/rolaxim.pdfIn PDF document text
- https://s3.amazonaws.com/tumasun/wadegemexig.pdfIn PDF document text
- https://19b6c5dd-7044-4bc4-a11e-ea80cf7064f5.filesusr.com/ugd/f34823_89ad31d098994ce9ac4bc6714e756072.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/c9faa682-65ae-479e-bb76-41095d43c07b/how_to_study_for_soa_exam_pa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/311006e9-2c5a-47ff-a2ce-9b11e5ed2c3d/forever_young_lyrics_bob_dylan_chords.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_off0000f3e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E7	5792 bytes
SHA-256: `c216ef4f6487c8a867ce8f72ffbaa673fc6620bab915a5f896f1d472f34a6433`
`font_01_sfnt_off0001076b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1076B	10140 bytes
SHA-256: `a75c031a629c6b236640ebb7b28a49ef54c8b49ea2428740a1cdb0691cf897f7`
`font_02_sfnt_off000129c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129C7	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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