PDF malware analysis — malicious · e54d44838d809800

MALICIOUS

PDF

77.7 KB Created: 2021-02-23 05:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30

MD5: c181b39d408d47f6f50a0c6e03df2b73 SHA-1: ecc6660a1df9ce4ddb8da9c6c1c4b06056e977f7 SHA-256: e54d44838d80980082e04d1b683a99e34ea5d463b3b0c058dca6847b6b17b12d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a potential phishing or malware distribution vector, possibly leveraging embedded JavaScript for execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=clasificacion+de+funciones+matematicas+pdf PDF link annotation
- https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/1741969.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4382638/normal_60033fc9d7fb5.pdfIn PDF document text
- https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/nulewab.pdfIn PDF document text
- https://jidevamomibowi.weebly.com/uploads/1/3/1/4/131437101/tuzugen.pdfIn PDF document text
- https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/bebb895f.pdfIn PDF document text
- https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/0ade2a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365525/normal_5fd8dc5741ae4.pdfIn PDF document text
- https://kidivine.weebly.com/uploads/1/3/4/5/134576756/pimajosotareke-vabekijejot-tojur-dozisiladi.pdfIn PDF document text
- https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/devukopunujetem.pdfIn PDF document text
- https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/nezujadinafap.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410207/normal_5fe8673d2aef8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384045/normal_601f8dab87437.pdfIn PDF document text
- https://kopodeju.weebly.com/uploads/1/3/1/4/131483627/2dba590a993.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369905/normal_5fceff9b70a62.pdfIn PDF document text
- https://juvinegedixipa.weebly.com/uploads/1/3/1/6/131637649/2336073.pdfIn PDF document text
- https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/2585082.pdfIn PDF document text
- https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/6be9d6ee482.pdfIn PDF document text
- https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/legipexadapif-nugisadivi-xuwisapakijud.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB2E	5108 bytes
SHA-256: `5bbf668337b0982cbdafad23c06edcd3b6be2b0974b90a2f6581fc6d38e7fb26`
`font_01_sfnt_off0000ec7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC7F	11400 bytes
SHA-256: `39de37626ea79b1603b45409002ed00af90966634f44e88450d2c1fc028a3eed`
`font_02_sfnt_off0001125b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1125B	16144 bytes
SHA-256: `05b1d0154eab266094d569d3251fc891204598a1f91ccd3ae02e0ba3a177de99`

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