PDF malware analysis — malicious · 83ff32498073c738

MALICIOUS

PDF

82.9 KB Created: 2021-03-06 11:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 245a6424b9d5c1cd5e5ce4e907b2ed95 SHA-1: d0568c8a67379f3e37dccc0f75019b2c86b68081 SHA-256: 83ff32498073c738a21d4f803fe72ba93a6cd55711a84d3ff7dd9608a90556aa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

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.
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://golowaki.ru/award?keyword=honeywell+ac+unit+mm14chcs PDF link annotation
- https://cdn.sqhk.co/lebereme/ughqPif/leadership_skills_mtd_training.pdfIn PDF document text
- https://cdn.sqhk.co/seranowe/jfhXGES/rowewusilan.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417998/normal_603669635b144.pdfIn PDF document text
- https://cdn.sqhk.co/fagaluwozez/hhZHvje/vuwiwavogupefudubabub.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4502493/normal_603409c356b01.pdfIn PDF document text
- https://cdn.sqhk.co/likamigid/hgjjehb/remix_lol_dolls_omg.pdfIn PDF document text
- https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/sipaguzuvod-kepuwowajuxenaz-sujafudu-xejopupise.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456712/normal_5fd65fdcd1ebe.pdfIn PDF document text
- https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/nivugi-xumesefi-tumiwaka-ritowikam.pdfIn PDF document text
- https://cdn.sqhk.co/mexovaru/MYigbO8/walmart_inventory_management_software.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459935/normal_5fe8cad826a35.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4496389/normal_6042ea119c3a8.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/0d0aa9d4-41c9-4ab4-afce-4f175072e82b/ferovugasodatomomalufet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/64bdf1a8-5c88-43de-990d-78aaa66b3cce/750_cc_into_horsepower.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d11f640b-cddc-478f-af29-e0443dce4914/rigafumuramemogujorujeru.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/598688b7-c82b-4e1f-9b1c-f7c47a1dc250/dubugales.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/df71788b-0812-4e1a-a85a-a9fb82abea0a/pimemejisejifajetejugav.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e4394462-ba69-4952-baa0-1fd26e0e0508/best_teaching_techniques_for_adults.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d5acf945-e697-415e-9c15-9947a1906811/2077059367.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/867cc3b8-455e-4a7e-b267-7afc87fe3e51/lobokepamig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/59f837ea-5068-4a93-9a72-f797bed7e5c5/instalacion_de_gas_estacionario_cdmx.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/eca187e4-2b19-4655-8784-284a37c360d6/74001891534.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_off0000f0ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0EC	5240 bytes
SHA-256: `b82f007527d7fa1a29852c1417265744c05943325e5110cbf162e7d8a1799a06`
`font_01_sfnt_off000102ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102BA	10696 bytes
SHA-256: `c781d429d781c66b73fcb69d0a0b033bc346e9af07c1aec7826c35082c601e91`
`font_02_sfnt_off00012780.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12780	16636 bytes
SHA-256: `47470221d3ca876131e579ed50933ed91ee673c93319779330c8b91e5d72bf49`

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