PDF malware analysis — malicious · c35651c49e0b60b2

MALICIOUS

PDF

88.5 KB Created: 2021-05-22 15:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: db947c68519bfba1a22f059b5564910e SHA-1: 43ed4a5f36f62c00ffd194a1f50a4421c2a62069 SHA-256: c35651c49e0b60b237f4eedfd21c67948063f8db8353173ac27515a7468c05a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are to other PDFs, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs point to suspicious domains, likely used to host phishing content or download further payloads. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

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.
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://soxebez.ru/strik?utm_term=guia+para+ingreso+a+secundaria+2021 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4416923/normal_60290d81281e3.pdfIn PDF document text
- https://kesetemokeze.weebly.com/uploads/1/3/2/6/132682820/1331186.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470405/normal_606e16754e9ec.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4415929/normal_5ff5f98268593.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481510/normal_60297e5914840.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4445320/normal_5fe2e673a4f1f.pdfIn PDF document text
- https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/pedef.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4401696/normal_6058e44c144cd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454184/normal_6064bdfc3d127.pdfIn PDF document text
- https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/f7ff784cb.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485166/normal_5fffce118a86e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415046/normal_6019d5170a35b.pdfIn PDF document text
- https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/xunibexugotirig.pdfIn PDF document text
- http://fontawesome.iohttp://fontawesome.io/license/In 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/8a0e5668-a98f-48d8-abea-a385fc309ddc/is_linksys_velop_good_for_gaming.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/51f99fcf-897b-4edb-bcb0-71699dffc183/adding_and_subtracting_fractions_with_like_denominators_worksheets_kuta.pdfIn PDF document text
- https://s3.amazonaws.com/gelawiweza/nazm_hikmetin_en_iyi_iir_kitab.pdfIn PDF document text
- https://s3.amazonaws.com/ragejufa/how_to_send_unofficial_gre_scores.pdfIn PDF document text
- https://s3.amazonaws.com/pojikovewijeja/lejazese.pdfIn PDF document text
- https://s3.amazonaws.com/tetofamuxulil/26688855087.pdfIn PDF document text
- https://s3.amazonaws.com/furunumaroxun/93241626529.pdfIn PDF document text
- https://s3.amazonaws.com/sivanira/witofejifimisa.pdfIn PDF document text
- https://s3.amazonaws.com/kevava/nekagatubososigonubosefe.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000101e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101E4	1688 bytes
SHA-256: `48477a8605c0f309bcaa5d75dc5c71cf5c25b28177ea44e07a8c78a823b250dd`
`font_01_sfnt_off00010a43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A43	5368 bytes
SHA-256: `d56ec37b33d3824b2653fe2bc2724f3e4b1b14359825eeaaf2a1edf64b3db458`
`font_02_sfnt_off00011c8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C8A	12148 bytes
SHA-256: `d5c10aaab7457843361d1ba4f63ddb86176771e08144e5125ff4ab6ea0fd0eea`
`font_03_sfnt_off000143aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143AA	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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