PDF malware analysis — malicious · b6bd89b2ddf79e95

MALICIOUS

PDF

71.5 KB Created: 2021-03-15 21:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: e9b375294c11fd74834876aefc3cbbe7 SHA-1: 6ee0d4cb1e3591cadb8ea95f90da9fcde0298a6b SHA-256: b6bd89b2ddf79e956077bf27992efeeec07f5c30a46e8a21090b24c7136937ba

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://kuzutuzo.ru/wix?keyword=tanaka+m1897+trench+gun PDF link annotation
- https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/befilogesoru.pdfIn PDF document text
- http://bagerisevi.scienceontheweb.net/23629987142.pdfIn PDF document text
- https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/bovuwipono.pdfIn PDF document text
- http://befujukipepejem.mygamesonline.org/german_grammar_books_for_beginners.pdfIn PDF document text
- https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/8aa5a.pdfIn PDF document text
- https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/67ff5.pdfIn PDF document text
- https://ginabedo.weebly.com/uploads/1/3/4/0/134017532/kunupi-ramumizu.pdfIn PDF document text
- http://gefaveje.22web.org/how_to_learn_the_music_industry_as_a_rapper.pdfIn PDF document text
- https://duzinalanidik.weebly.com/uploads/1/3/4/7/134760416/a8e4127d.pdfIn PDF document text
- https://kelulove.weebly.com/uploads/1/3/0/7/130775366/9187369.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://zujetisapapido.rf.gd/24874092397.pdfIn PDF document text
- https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_efe1d8cb22ab45db82c07db44329b0cc.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bevarolimesale/getusumasil.pdfIn PDF document text
- https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_256d45870dd94f4eba6cf63b52663e6c.pdf?index=trueIn PDF document text
- https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_4bf2a266047549639fb9c7212145af05.pdf?index=trueIn PDF document text
- https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_03acaf95e1794d2e97a8223d95016ace.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xidazeze/literary_theory_an_introduction_summary.pdfIn PDF document text
- https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_afd2a377df6e45db9e509afa44c83f90.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/daniwodug/52714879583.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_off0000cc25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC25	3268 bytes
SHA-256: `42199ec2a12a1f26b6c70d1131967b497da83680a73b27869e9f8552934ac923`
`font_01_sfnt_off0000d7b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7B5	5496 bytes
SHA-256: `81144afce15b2eedcc8bb8505e5bc7e6bf0e4cd27d73b9d05bcdaefdbc1ca4f2`
`font_02_sfnt_off0000ea50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA50	11152 bytes
SHA-256: `7d927604804a4f435addd9b3d4f2b6b6e20c304129bcd488be2c6d246012a482`

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