PDF malware analysis — malicious · 15f1187f8d2378cd

MALICIOUS

PDF

83.4 KB Created: 2021-03-15 14:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 1fdd9e6d247abdec96d0ffe94e516358 SHA-1: a73629308c6cf32e00d8927f30773835612f249d SHA-256: 15f1187f8d2378cd675728265dce9be4ea1de3ab2f946b78399e0c52bde8ed5a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous external URLs pointing to other PDFs hosted on disposable domains, likely to manipulate search engine results or distribute further malicious content. The PDF itself contains minimal readable content, suggesting its primary purpose is to act as a redirector.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
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://mezovuduw.ru/award?keyword=que+es+un+brief+publicitario+pdf PDF link annotation
- https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/5260190.pdfIn PDF document text
- https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/3f6042e6f.pdfIn PDF document text
- http://cesaregaspari.com/jimokini8cy0p.pdfIn PDF document text
- https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/5053294.pdfIn PDF document text
- http://medicinfo.online/xutujawdx84.pdfIn PDF document text
- http://mandarins.space/commercial_invoice_template_euroe2nt9.pdfIn PDF document text
- https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/61b38579.pdfIn PDF document text
- https://pebabole.weebly.com/uploads/1/3/4/6/134698512/vubirav.pdfIn PDF document text
- https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/tenizogumam.pdfIn PDF document text
- http://digitalmedialit.com/farsi_language_course49t54.pdfIn PDF document text
- https://sibanomo.weebly.com/uploads/1/3/0/9/130969588/pilokenem.pdfIn PDF document text
- https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/1cbfaecb1806d1f.pdfIn PDF document text
- http://ppl-nutrshopfit.website/pekifozifufiwuvlf18u.pdfIn PDF document text
- https://momosedudufapi.weebly.com/uploads/1/3/4/6/134622660/gupobu.pdfIn PDF document text
- https://terurudib.weebly.com/uploads/1/3/4/3/134381327/xitodawi_porisivavej_jixewege_zivanefit.pdfIn PDF document text
- https://bururinuriz.weebly.com/uploads/1/3/4/8/134882015/golaxaloge-seloxiw-gigas.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/ff1e087e-4c7f-4694-ae26-83b88e3cd365/terogiwo.pdfIn PDF document text
- https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_31b9be8501df429fbbe6a5055980438e.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/aa4e2101-3a86-46c0-8b4b-41e4b16b3fd6/6683853731.pdfIn PDF document text
- https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_00831436e98a476d939e7d2af4c389fb.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_off0000f907.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF907	5232 bytes
SHA-256: `a28a0a813d55fb5b96c2700420136e0ddd09f58cbdb91348c56436bdc51a6f65`
`font_01_sfnt_off00010ace.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ACE	11764 bytes
SHA-256: `f8e3c847f038020d00864528881bb88743a5e1e2ef4ef65c33492fca1da67f86`
`font_02_sfnt_off000130db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130DB	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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