PDF malware analysis — malicious · 97d6fc949a6cfdec

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 05:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 91c9e3c79b1452e87824c01d76d389f5 SHA-1: bc0207cba660159e2eb77bbb03fbfd7ece40aee2 SHA-256: 97d6fc949a6cfdecadaf5bfb0c3e809abfd4a045ad70467c704c6ac38aad0f35

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a tactic of using a seemingly innocuous document to drive traffic to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
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://jacksth.ru/strik?utm_term=how+to+setup+amazon+echo+show+8 PDF link annotation
- http://jewogipuwivi.medianewsonline.com/gemstone_meanings.pdfIn PDF document text
- http://bepifukikuku.mygamesonline.org/20225656209.pdfIn PDF document text
- http://jekefidaz.mygamesonline.org/amiodarona_dosis_en_fibrilacion_auricular.pdfIn PDF document text
- http://xoziduso.mypressonline.com/xa_trang_trng_trong_file_online.pdfIn PDF document text
- http://tupaxeguna.scienceontheweb.net/renodesojodujesuk.pdfIn PDF document text
- http://woziwowariv.sportsontheweb.net/73709642231.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_2720b65b5645452ca6e0e98d7353c2f2.pdf?index=trueIn PDF document text
- https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_5c192e52713c4b80bd9c7e66946ec5bb.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/34dee5ed-20e8-4cad-921a-1d62224c5100/44861639132.pdfIn PDF document text
- https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_8a043f38358e40fbaa48a50b1414670d.pdf?index=trueIn PDF document text
- https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d80e691a17704801a608a2e72a64aff4.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/c18a6a51-a5f3-43d3-9b7d-551e74d1f363/how_many_pages_in_harry_potter_and_the_half_blood_prince.pdfIn PDF document text
- https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_71aab488e09548afa8d3b97f6893bbab.pdf?index=trueIn PDF document text
- https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ac43b7b9a94b461c81f935f717fecb75.pdf?index=trueIn PDF document text
- https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_eda78fadffa74fde983e90e82bf2c3d2.pdf?index=trueIn PDF document text
- https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_b72739dbec54457dbfde19564b78cc88.pdf?index=trueIn PDF document text
- https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_4126df4a66c840ee9e485c906c0d1640.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b98d68d9-9d95-42a1-ae59-be587df3d0c0/fuzabuta.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e630.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE630	5340 bytes
SHA-256: `527f5d3f6d30e65e1a58531b099cd8c4288fac2d8a0276c103d7c71b8ae8c9c6`
`font_01_sfnt_off0000f855.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF855	10776 bytes
SHA-256: `bacff7eb31d39fefa415f89b2f56b05d09fb5d1d9faf3dc1ca168df1ca3b6ef9`

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