PDF malware analysis — malicious · a8a4bbbf84fe7b63

MALICIOUS

PDF

83.6 KB Created: 2021-02-12 11:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 133210ec3a526cf810a12fe4823252ec SHA-1: b166aff3e586602e1222fb220492cca14faf1cc4 SHA-256: a8a4bbbf84fe7b63fffed0bef022a1e54dcd720b3f527bf18ddd63d7c1f34511

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classification and ClamAV, indicating a high probability of malicious intent. The document contains a large number of external links, suggesting it functions as a link farm or a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used for SEO manipulation and potentially distributing further malicious content or leading users to phishing sites.

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://druttle.ru/wb?keyword=auditing%20assurance%20services%206th%20edition%20pdf PDF link annotation
- https://cdn.sqhk.co/vaxarogajib/go8lV3h/46985807121.pdfIn PDF document text
- https://cdn.sqhk.co/xuzalolotagi/jmQgjVy/62333963483.pdfIn PDF document text
- https://cdn.sqhk.co/tevosenijosu/Tf2hegd/throne_of_blood_movie_characters.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393637/normal_60142ce77e423.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe58ef1378.pdfIn PDF document text
- https://penebiji.weebly.com/uploads/1/3/5/3/135346042/5d28fd4348.pdfIn PDF document text
- https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/zijitixede-vesinegopifa-wuvuretop-folaselanere.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478961/normal_5fd08011c31f2.pdfIn PDF document text
- https://cdn.sqhk.co/ropimipaf/b1djbie/87080665577.pdfIn PDF document text
- https://cdn.sqhk.co/difigobon/fLjiges/popular_ringtones_2019_english.pdfIn PDF document text
- https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/723688.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384144/normal_601dd2dd0a624.pdfIn PDF document text
- https://furadigiwib.weebly.com/uploads/1/3/1/4/131407367/fa4f815bd0.pdfIn PDF document text
- https://cdn.sqhk.co/fugolamudara/DJmhe2o/favo_de_mel_goiania_valor.pdfIn PDF document text
- https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/zuxaxir.pdfIn PDF document text
- https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/sixigonubuxo.pdfIn PDF document text
- https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/32c360de7d7f6.pdfIn PDF document text
- https://cdn.sqhk.co/mitukutowum/gcKQigU/koratizi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427313/normal_5fd6efc75ea1e.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
- 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_off0000fb7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB7C	5472 bytes
SHA-256: `b7bcf2d8a5b8778a3312fd02e893aff22bd5bc8f20a4f90713e720694ef3b7b9`
`font_01_sfnt_off00010e13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E13	10844 bytes
SHA-256: `8d8ea3249811222361832194e5ca8bad0d86e3d4fbe7e379ab3866ab073d30be`
`font_02_sfnt_off000132af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132AF	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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