PDF malware analysis — malicious · bbfec3f0d626eed3

MALICIOUS

PDF

72.8 KB Created: 2020-11-12 21:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27

MD5: aea23e40a5c408c4a9a6e91fff2a87eb SHA-1: 0c9e0d6be126d643457c11dca622af1d2f4a778b SHA-256: bbfec3f0d626eed34ac57089919fe439fe34f82e051cc07339414ae2ea5c3e93

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a URL pointing to a known malicious redirector further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://traffine.ru/123?utm_term=glencoe+algebra+1+chapter+3+answers In PDF document text
- https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/loted.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366008/normal_5f873d52779ce.pdfIn PDF document text
- https://puvujoda.weebly.com/uploads/1/3/4/3/134326666/5169057.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372707/normal_5f9b13cdd58fe.pdfIn PDF document text
- https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/8ce4384d566a.pdfIn PDF document text
- https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/35c2026.pdfIn PDF document text
- https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/358210d4ddf3.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/496139a5-b0b9-47e6-a492-f1e8ba3e425d/68459092794.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3c0103ba-95f7-48fc-b889-0e97aa690e84/witulujumi.pdfIn PDF document text
- https://s3.amazonaws.com/zugutixe/amoeba_sisters_video_recap_cell_transport_answers.pdfIn PDF document text
- https://s3.amazonaws.com/tugumeb/101034735.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6df31f76-0c00-47b6-a6bd-976af9b26fc6/kemugusotumere.pdfIn PDF document text
- https://s3.amazonaws.com/badodemebo/30497675366.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8dbb2490-71e2-446e-a37f-8666705f1292/joygame_zula_indir.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d62a34de-23b4-4121-a962-146ae4015a69/64598193172.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ea16d283-c29b-4f93-a921-4c45683cc93a/gamigejosajuronumozu.pdfIn PDF document text
- https://s3.amazonaws.com/zikeko/64487513765.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_off0000cef2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEF2	5412 bytes
SHA-256: `9aac3685a9f92449f7ee73f067e7a4c1e98a6f3fc3b3c71c8d33e76a6d04ffb6`
`font_01_sfnt_off0000e168.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE168	11456 bytes
SHA-256: `4f17554d73b42dc6c796f743240513d434437dbd10d5dca619dc7294b96d8e6a`
`font_02_sfnt_off00010842.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10842	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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