PDF malware analysis — malicious · ed953d5c15aeb755

MALICIOUS

PDF

82.1 KB Created: 2021-03-09 10:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: f8b87161334608386834895967b8c75c SHA-1: 40a7f8ff2c4cc8f9d3b8dc76028a6d1c2e87ecb4 SHA-256: ed953d5c15aeb7555f5e2434aaa88e29a04c4de731713406678b395fd88dc8e5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=carney+complex+case+report PDF link annotation
- https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/rixewebut-zojaj-tosuwa.pdfIn PDF document text
- https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/5d669dbb78f.pdfIn PDF document text
- http://bomaduworofa.medianewsonline.com/american_standard_furnace_model_s8b1b080m4p_xaa_troubleshooting.pdfIn PDF document text
- https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/3349172.pdfIn PDF document text
- https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/4956888.pdfIn PDF document text
- https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/9bee33c7b001.pdfIn PDF document text
- https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/314e4e243e6fee2.pdfIn PDF document text
- https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/jorak.pdfIn PDF document text
- http://netopodimamo.mywebcommunity.org/byju_s_business_development_associate_interview_questions_and_answers.pdfIn PDF document text
- http://tapozifokun.mywebcommunity.org/buvomiwoxojajalaxedegudi.pdfIn PDF document text
- https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/solularu.pdfIn PDF document text
- https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/68626.pdfIn PDF document text
- https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/780c7.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_7f03903ef2cf4fc7a55918478d6e3044.pdf?index=trueIn PDF document text
- https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d8306bb5c9a04a40bb995d223695fe9d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gebukil/31765395563.pdfIn PDF document text
- https://s3.amazonaws.com/gopifu/customer_journey_template_excel.pdfIn PDF document text
- https://s3.amazonaws.com/jidosatikim/vojubikevatigu.pdfIn PDF document text
- http://sukokovevaz.atwebpages.com/optimate_4_dual_can_bus_bedienungsanleitung.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_off0000edf7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDF7	5156 bytes
SHA-256: `895db8a014e581fafa281fa0a5f1de5cf3cf7db45fc4d13fcc282df07b66cc71`
`font_01_sfnt_off0000ff74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF74	11344 bytes
SHA-256: `cb70d98080f829e0d6ff5ccc6bd53ba0c281c9fbce59dae0864241caa4db90fa`
`font_02_sfnt_off00012645.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12645	16148 bytes
SHA-256: `ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0`

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