PDF malware analysis — malicious · 73ef5e6da9f52cbe

MALICIOUS

PDF

119.1 KB Created: 2020-11-26 22:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05

MD5: abd1a43f23c62a0f7856d3a1446db834 SHA-1: baeb847672fe39e5f1046db35b2f8aff749cbf37 SHA-256: 73ef5e6da9f52cbe02ea30151f5d77afbac1f6a22a388b443ef4ff1d75e64146

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf. The primary malicious activity appears to be the inclusion of numerous external links, many pointing to disposable hosting services and a known malicious redirector, suggesting an attempt to lead users to phishing or malware distribution 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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://ggtraff.ru/123?utm_term=dios+no+oye+a+los+pecadores+vers%25C3%25ADculos In PDF document text
- https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/daa8f5bed6db.pdfIn PDF document text
- https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/lodutusadewod-xadab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454182/normal_5fa64b54cbd52.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453334/normal_5fa5b3e3830ee.pdfIn PDF document text
- https://vakufijasulu.weebly.com/uploads/1/3/4/5/134592391/fatozigibepokig.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443578/normal_5f9c39ed93155.pdfIn PDF document text
- https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/425525.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376099/normal_5f9a6bf1e44ec.pdfIn PDF document text
- https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/dedokugaru.pdfIn PDF document text
- https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/gufimojawuvisupi.pdfIn PDF document text
- https://wujewogo.weebly.com/uploads/1/3/4/5/134586314/jejefafelibepor.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411683/normal_5fbefb0221db6.pdfIn PDF document text
- https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/8577819.pdfIn PDF document text
- https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/0ffcc430.pdfIn PDF document text
- https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/15ae63.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4463792/normal_5fae3a52c3c33.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/f2334c2c-120d-406d-82fe-605d39d13c60/mopazuborex.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_off00018662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18662	3820 bytes
SHA-256: `a597dbba828eacb0470110676f10b8644b555ecc293cde04c71bdcded52936e3`
`font_01_sfnt_off000193df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x193DF	5284 bytes
SHA-256: `c3bcadec10bc87a6e76b600dd22543a93c78a346fb9222c1b535152d5eb069ec`
`font_02_sfnt_off0001a5f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A5F9	11828 bytes
SHA-256: `b95a50798d6b5270a678a0f227a70952e163009140efebdd1d67ef414195277d`

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