PDF malware analysis — malicious · 334fe889de64ef5f

MALICIOUS

PDF

94.5 KB Created: 2021-06-08 05:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: ead6c58f92fda6a5f7b4e88c2c4f5193 SHA-1: 66f9b51eb55f2e74f80d8acbd4efa763dfd7005e SHA-256: 334fe889de64ef5fc6b319909c5142d97f965a40f234afd0d003b688ce0ca4ce

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a link farm with numerous external PDF URLs, including one pointing to 'laborke.ru', suggesting an attempt to redirect users to potentially harmful content or downloads. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/pbw?utm_term=cube+surfer+download+pc PDF link annotation
- https://cdn-cms.f-static.net/uploads/4387590/normal_5fd6daf95d2df.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4406456/normal_6026f8cff06c6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366653/normal_5fd08f10ce0eb.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403565/normal_5ff77a0965d41.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4444853/normal_60b5a48c3fe22.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402956/normal_605329a90cad0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367961/normal_604a20750191d.pdfIn PDF document text
- https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/sifesokujijuwanake.pdfIn PDF document text
- https://luxotavazab.weebly.com/uploads/1/3/4/3/134349810/2395908.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426823/normal_5fd98ac415bf8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422894/normal_5fd8b3da3b96c.pdfIn PDF document text
- https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/4564291.pdfIn PDF document text
- https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/5435415.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4499300/normal_606e3bf38390e.pdfIn PDF document text
- https://tabawowap.weebly.com/uploads/1/3/4/5/134599755/vejolonuvelu.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/ff40cda7-2984-4cc8-ba50-6b36bc462c3d/liloru.pdfIn PDF document text
- http://tikomegeto.pbworks.com/w/file/fetch/144576114/817131933.pdfIn PDF document text
- http://wiwudoje.pbworks.com/w/file/fetch/144597963/teziwasiduxiza.pdfIn PDF document text
- http://mavawakuto.pbworks.com/w/file/fetch/144784125/investment_funds_in_canada_textbook.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/41578755-8f9a-4a18-8670-be3872ee83c1/american_journey_history_textbook_8th_grade.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f3778945-9e3a-48e6-92ef-a29e0951596f/fugijowibowararevizetune.pdfIn PDF document text
- http://sodopateduke.pbworks.com/w/file/fetch/144426555/55552745403.pdfIn PDF document text
- http://xizisimavi.pbworks.com/w/file/fetch/144543795/free_learning_management_system_wordpress_theme.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e7ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7EE	5284 bytes
SHA-256: `461eabd0d9be580d5262d7449fdb21c5a1c2293b92e22a0ca1a2c72fd6c4c3b7`
`font_01_sfnt_off0000f9f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9F8	11668 bytes
SHA-256: `20bbe118ec2703f1afd7311cb281bbb333ded3dce20e8e6f03bc3d5378acd982`
`font_02_sfnt_off00011736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11736	15932 bytes
SHA-256: `38f1461a9b5b528a4c9c88ca6939fd6c8182129711d53037a17ebbbd9fd57e97`
`font_03_sfnt_off0001484e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1484E	17564 bytes
SHA-256: `edcae53dd5ba0b411e8981c6b4a6d7508cb4570a0ab2779e1887589bd422fed4`
`font_04_sfnt_off00016208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16208	1736 bytes
SHA-256: `1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19`

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