PDF malware analysis — malicious · 0e028c8103d71aa4

MALICIOUS

PDF

84.5 KB Created: 2021-03-17 12:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: e91b13dd517abf68dd2e4ce7e36912ad SHA-1: b8f90db8e54fcc7dfeac4eb2a4ad103a5c3828f9 SHA-256: 0e028c8103d71aa4a0c7ea8fdd5ca5c8eb0f72f610a459774834023c418825f7

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The presence of a large number of links on disposable hosting, coupled with the ML classifier and ClamAV detection, strongly suggests a malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure itself is used to host and link to potentially harmful content.

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://jottigo.ru/123?utm_term=ansoff+matrix+pdf+journal PDF link annotation
- https://cdn.sqhk.co/nimuxugemu/C0wegha/26294886184.pdfIn PDF document text
- https://reravojune.weebly.com/uploads/1/3/1/4/131406269/vunurel.pdfIn PDF document text
- https://nunugaborunis.weebly.com/uploads/1/3/1/4/131437119/bibubinid.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4416304/normal_5fc66cfbc14ef.pdfIn PDF document text
- https://cdn.sqhk.co/dutaxato/ih1ibhh/sadowomujanonovanitanu.pdfIn PDF document text
- https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/6961512.pdfIn PDF document text
- https://cdn.sqhk.co/xewafazuk/h5idiat/scruff_meaning_in_urdu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472788/normal_6025141f50e53.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421477/normal_6001e5d18af89.pdfIn PDF document text
- https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/vebixo_xajatajepixo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_90d84aceb1ce43c2a8d0077eab89d360.pdf?index=trueIn PDF document text
- http://gejujebiwibi.epizy.com/asus_b85m-e_csm_motherboard_manual.pdfIn PDF document text
- https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_dac07de29c4a4bc790e9be82e5454e53.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xugigabitulu/honda_self_propelled_lawn_mower_cable_adjustment.pdfIn PDF document text
- https://s3.amazonaws.com/bibejovixapis/kan_beveiligde_niet_printen.pdfIn PDF document text
- http://ninalosuza.rf.gd/zebiwo.pdfIn PDF document text
- http://xarigezosuwa.rf.gd/93809796510.pdfIn PDF document text
- https://s3.amazonaws.com/mexijegedakol/mijufunofipekojojinidajid.pdfIn PDF document text
- https://s3.amazonaws.com/minaxigevani/nigewuruwovuf.pdfIn PDF document text
- https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_c14c1307a3fa4b7aae4765f37862963e.pdf?index=trueIn PDF document text
- http://dikazimizoban.epizy.com/nudezonamogufaji.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010d57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D57	5320 bytes
SHA-256: `a51ac69751d9e9ed48b78afeabadad6ee8ac26ab561f724f4c381ad5729c6eb5`
`font_01_sfnt_off00011f63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F63	11128 bytes
SHA-256: `cd4309ab916861b2c21d98c66bba10a3972d957d8527f82993ef631d85eec580`

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