PDF malware analysis — malicious · 3421c38a214e3a10

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 07:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 4e4cf55acf02378f194d68fe59374448 SHA-1: cf6b73a0d6e9a4f428b54b7d9f466b56fd66a5c9 SHA-256: 3421c38a214e3a10667e4fb7fbf3dd170d8f7f98aa316698d7cba6eb66a50a30

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a URL that appears to be part of a link farm designed to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links, some on disposable hosting, indicates a pattern of distributing malware disguised as legitimate downloads. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

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/award?keyword=ashrae+fundamentals+handbook+2020+pdf+free+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4491665/normal_6019f90ba1ad9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460243/normal_602ec3d8274be.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382639/normal_6013a63b08dc5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4378157/normal_5fc57df62f7df.pdfIn PDF document text
- http://bawikivogo.22web.org/who_is_the_birds_papaya_ex_husband.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421036/normal_602e3a527ac9f.pdfIn PDF document text
- https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/44cd056cad3c16c.pdfIn PDF document text
- http://vinimifij.iblogger.org/liderazgo_transformacional_ventajas_y_desventajas.pdfIn PDF document text
- https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/zitew_rusuvadupidulam.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495841/normal_60419c9d285ee.pdfIn PDF document text
- https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/85a0c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4444371/normal_5fce7cdcedbac.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424011/normal_602f9f595425f.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/e148a93c-b232-4ee9-98b4-1a7b5b2dce25/38997040331.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/078f3f1a-6ec5-46d2-8a7f-2e52a14917f4/delarujurujum.pdfIn PDF document text
- http://desejiboferade.rf.gd/50008577977.pdfIn PDF document text
- http://vazavaxajude.rf.gd/windows_7_activation_key_generator_free.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/48f45d61-50d3-4a75-86fa-fa65d303f49e/50273954498.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f9f462ba-8626-48ca-a5a8-938b1d11397f/53204311857.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/54e1fc86-0812-4ccf-9b4c-b23b4bbf43c9/nedezi.pdfIn PDF document text
- http://galexuduxegi.epizy.com/trao_de_anemia_falciforme_tem_sintomas.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ba418f44-b02a-4a62-a806-cc7e3f63bd81/sistema_endocrino_hormonal.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_off0000d63f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD63F	5676 bytes
SHA-256: `52ed641e1fb584568379fa3f63d122c5048c9745e79ee8e988d791ae09d57011`
`font_01_sfnt_off0000e95f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE95F	13204 bytes
SHA-256: `58cdfbf330608e4d08eb3478201c3fbbb07019468b04ddc6ee512f4f5b2b1e30`
`font_02_sfnt_off000114fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114FB	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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