PDF malware analysis — malicious · c281e2631072ab40

MALICIOUS

PDF

73.4 KB Created: 2021-03-23 06:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22

MD5: 26ad0f40240b9e1eba5a4caf6bd3794a SHA-1: 70404b8826def23aab4bae4b6da1fa5fa409ef2e SHA-256: c281e2631072ab404a36170dbbdc0487860ab5f9f27afd9d8a395031e609886d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=integrated+chinese+level+1+part+2+workbook+pdf+download PDF link annotation
- https://static.s123-cdn-static.com/uploads/4410459/normal_5ffb8acf2f95e.pdfIn PDF document text
- https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/retikawepo_sugaxaxena_muzelidojipuxa_xewufumotex.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf7c1b12dc.pdfIn PDF document text
- https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/gegibobuwavox.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379219/normal_602a0cf33f766.pdfIn PDF document text
- https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/8562080.pdfIn PDF document text
- https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/todotokamolediz_xebigobilagi.pdfIn PDF document text
- https://bufaxivija.weebly.com/uploads/1/3/1/3/131383981/liruladomepil-tudaxuzixoso.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475863/normal_6012e3263e173.pdfIn PDF document text
- https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/961777.pdfIn PDF document text
- https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/goxutoramox.pdfIn PDF document text
- https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/2266403.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4489237/normal_600591a235366.pdfIn PDF document text
- https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/7240ad93a42c73c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/satedafadusizo/cynthia_morgan_in_love_audio.pdfIn PDF document text
- https://s3.amazonaws.com/veraxawewib/dr_fate_injustice_2_guide.pdfIn PDF document text
- https://s3.amazonaws.com/fajeloninesitel/attorney_general_william_barr_contact_information.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_off0000c961.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC961	4076 bytes
SHA-256: `d16bdac6d310b7dd504bb5d4081585ee2773ad0bd20859bd318d387e57c28386`
`font_01_sfnt_off0000d7e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7E5	5896 bytes
SHA-256: `c9dec65dfeb4099e69b49e5768f0eee5058651e59d0259200b28bba693426b8c`
`font_02_sfnt_off0000ec12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC12	13152 bytes
SHA-256: `821584b2c2213faf71b9b24da0c87a7184d7bb27bb430f60a0d6ded35166d19e`

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