PDF malware analysis — malicious · 2f3ac12a91bbd91b

MALICIOUS

PDF

85.0 KB Created: 2021-03-17 04:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 0302bf9454bbec76c21e13a015146971 SHA-1: 298c8212bb7e90c6575810f82278ae02ad2e9912 SHA-256: 2f3ac12a91bbd91b7f21659f3a27aef738504445e83b498da69ee33e733f38e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, many of which point to SEO-optimized PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is jacksth.ru, which is likely used to host a phishing page or a further stage of the attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/award?keyword=biblical+hebrew+textbook+pdf PDF link annotation
- https://cdn.sqhk.co/jivazufevi/ejfdjj4/galaxy_comics_brooklyn.pdfIn PDF document text
- https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/395e47a88bb.pdfIn PDF document text
- https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/85dc5ab4.pdfIn PDF document text
- https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/8ed028f83.pdfIn PDF document text
- https://cdn.sqhk.co/zowonefaso/icY1Nif/street_fighter_4_mod_apk_offline.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://uploads.strikinglycdn.com/files/a09dc279-9e09-43af-9634-d56b56383a69/99933260673.pdfIn PDF document text
- https://s3.amazonaws.com/fotepopunaj/zeraxujetiwo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0d06175c-af69-471a-8462-d20c75e82dfb/temofafozit.pdfIn PDF document text
- https://s3.amazonaws.com/sazixipame/73787820036.pdfIn PDF document text
- https://s3.amazonaws.com/mudurixo/rapowew.pdfIn PDF document text
- https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_080bb3b4e8bb41559f0a69fbb8c86634.pdf?index=trueIn PDF document text
- https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_8a0f6879a4a049f0b70dd16d25faa629.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/mukutud/birthday_invitation_card_format.pdfIn PDF document text
- https://s3.amazonaws.com/xovekolamoxe/90806422666.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/241eec69-138d-4f91-bf42-d548964390f2/carvel_ice_cream_cake_recipe.pdfIn PDF document text
- https://s3.amazonaws.com/pegozegi/explain_how_alluvial_fans_and_deltas_form.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4b4e57fb-2e8e-4044-b54b-4e62d436ffbf/girl_boss_movie_times.pdfIn PDF document text
- https://s3.amazonaws.com/wopari/best_antivirus_for_android_2018.pdfIn PDF document text
- https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_208dfaa901364becae6df5f9f2b05561.pdf?index=trueIn PDF document text
- https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_6890608b914b4ec4ae96395ca9705d2b.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xufaxoferugod/iptv_smarters_pro_apk_for_windows.pdfIn PDF document text
- https://s3.amazonaws.com/sedimeraxufi/gilogozudi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/49a1ad78-9eeb-420d-aaae-53f9567c6e03/how_to_reset_roomba_870.pdfIn PDF document text
- https://s3.amazonaws.com/jazofi/sutodirizutowa.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_off0000fe19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE19	5160 bytes
SHA-256: `0df03672caaced8d919cd2c3daf65f066ece27ba87d074efab1d92752f489138`
`font_01_sfnt_off00010fc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FC1	11768 bytes
SHA-256: `b8282550bdc8b41f6da964d02128c860923f19cf7a110f367b73397c0c4d9d6b`
`font_02_sfnt_off00013818.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13818	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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