PDF malware analysis — malicious · bd4a55ea688ac300

MALICIOUS

PDF

85.6 KB Created: 2021-05-13 07:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 99bbcfa545f0294a040b1b69c5a620b3 SHA-1: 55e1517e555a8e6f0cd91f224a0876b1f56784e1 SHA-256: bd4a55ea688ac300d3e07b3112e119f2d27f8b43d98baec3aef6d29903938e89

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://midufefew.ru/strik?utm_term=verbos+mas+usados+en+ingles+presente+pasado+y+participio+pdf', which is likely part of a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=verbos+mas+usados+en+ingles+presente+pasado+y+participio+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4408475/normal_5ff4b39180050.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4488141/normal_5fe0fcf56aee4.pdfIn PDF document text
- https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/c29d672ea99.pdfIn PDF document text
- https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/a4d166.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403410/normal_60126e4b11254.pdfIn PDF document text
- https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/a887ccdf32126.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4380675/normal_5fc943e180d3a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480148/normal_5fc93f52b898b.pdfIn PDF document text
- https://cdn.sqhk.co/dasofuduveje/ycijNXN/xasowewuginugovalexokid.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474759/normal_602706f9179b4.pdfIn PDF document text
- https://cdn.sqhk.co/puroneruk/UYicjgy/mesino.pdfIn PDF document text
- https://cdn.sqhk.co/sonometa/ie4ge80/popular_hashtags_on_instagram_for_art.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421613/normal_6000eabf7ccf0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470224/normal_604cd12c0c63b.pdfIn 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://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_42dc59b1672541d4b2d958d725634c2a.pdf?index=trueIn PDF document text
- http://rixupod.rf.gd/el_caballo_de_troya_historia_resumen.pdfIn PDF document text
- https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_4ad3496a0e99474087fe4b56db86190d.pdf?index=trueIn PDF document text
- https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_b7dd50406b63468fbfb35847352d34ce.pdf?index=trueIn PDF document text
- https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_6a26965dc5904c55ab69ae3dd88c2ba8.pdf?index=trueIn PDF document text
- http://miloxagiwe.epizy.com/zobipizejav.pdfIn PDF document text
- http://nivugugop.rf.gd/richard_bandler_and_john_grinder.pdfIn PDF document text
- https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_61d5130dd8014ca781b0e2dc307d3f81.pdf?index=trueIn 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_off0000f4ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4AB	5564 bytes
SHA-256: `c79d5a20021622966823285b946e3f8d48395fe5cc8367e3966a3e651e9a7739`
`font_01_sfnt_off00010775.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10775	4440 bytes
SHA-256: `6db0675c84f7a2dde178820eff6810dc20bba5e2a583050ee7e5dac434f61b53`
`font_02_sfnt_off0001135d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1135D	11200 bytes
SHA-256: `73ef3bc5c206e7b9f19956e557b68bc6855a83300d28010311c9b6eef01c0227`
`font_03_sfnt_off0001382e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1382E	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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