PDF malware analysis — malicious · 74b4a480f64833a5

MALICIOUS

PDF

95.2 KB Created: 2021-05-29 06:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: cce413dff4cfc42cc8055e91fab4be12 SHA-1: 5384c4430d2f978326642d88899792ee9e9514d8 SHA-256: 74b4a480f64833a5caebacd82fb71e88f748ff57ff57278f8f9c8d42e2714712

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 0.9997

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://resalured.ru/123?utm_term=learnzillion+guidebooks+9th+grade PDF link annotation
- https://cdn-cms.f-static.net/uploads/4465564/normal_6033d199eec4a.pdfIn PDF document text
- https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/zawalubumipaxavul.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469386/normal_5fdabf5f6473c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379960/normal_605c347068802.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456660/normal_6051c40f6f265.pdfIn PDF document text
- https://zomipawir.weebly.com/uploads/1/3/4/8/134899005/7599517.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4427300/normal_5ff70ad33d0e7.pdfIn PDF document text
- https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/gagixojirem.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4452382/normal_5fef7ee6713ef.pdfIn PDF document text
- https://butiziro.weebly.com/uploads/1/3/4/3/134308177/wogufimur-kajelugozuped-wulotel-linawaxalupa.pdfIn PDF document text
- https://wumijamu.weebly.com/uploads/1/3/4/7/134764569/854392.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409243/normal_600cd060185ec.pdfIn PDF document text
- https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/juranaludatete.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495691/normal_602b09fd0933d.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4406787/normal_60b0825659319.pdfIn PDF document text
- https://wojawuminusevob.weebly.com/uploads/1/3/4/6/134694879/pinefaroxerunew.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4367922/normal_60053073a2cac.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451227/normal_6017a941ac76b.pdfIn PDF document text
- https://www.lpb.org/schedulehttps://wwIn 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/5852e1ff-2495-4e46-b354-ef7207360322/dakululuz.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d5120e8e-5d49-4217-b9d4-6d583433209d/vekar.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012083.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12083	5436 bytes
SHA-256: `f59e9bb3ce3e7a8ffda723cae7504d7fceed4033c9a9083132497fb5328a71e4`
`font_01_sfnt_off000132f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132F8	11232 bytes
SHA-256: `0237fefe4a3ab7776646ec4a8ccc9f0f0b63e1af893409c5671f3938ef2baf4d`
`font_02_sfnt_off00015975.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15975	16204 bytes
SHA-256: `532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e`

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