PDF malware analysis — malicious · f5a4a1bdbddfa341

MALICIOUS

PDF

81.5 KB Created: 2021-06-10 23:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 31becc4d76894a955fb1a786b9cd7ee5 SHA-1: c75ac3f4ca3d0046187495ad3adafa59b51f105a SHA-256: f5a4a1bdbddfa341bf1e59670f3b8807edd051a0f99dbaf1e344eba64e24d0bd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm. The embedded URL 'https://smidgel.ru/pbw?utm_term=cia+3ds+games+download' suggests a lure for potentially malicious downloads. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
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://smidgel.ru/pbw?utm_term=cia+3ds+games+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4388818/normal_601e2348334e4.pdfIn PDF document text
- https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/fixakop.pdfIn PDF document text
- https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/kumaxama-diforalu-nemazopejafaf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4388173/normal_60080a61c9aac.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4472763/normal_5fee36224a2b9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4423732/normal_5fec9573b0308.pdfIn PDF document text
- https://jujijojof.weebly.com/uploads/1/3/4/3/134353579/9033745.pdfIn PDF document text
- https://bovakexigi.weebly.com/uploads/1/3/5/3/135314068/5289404.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/753387a9-f52e-4327-8360-75ae7452c814/7229602610.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3ed50837-303d-412d-b811-51f080b10a07/joxenove.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6e3872d1-49f8-4ef7-8d24-aba1489ac152/rozogiporulevow.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dabe6bad-cfd8-4ef8-849e-b5af63fcb9d1/62464093227.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cf762dba-d632-4c50-873e-83de25ce57b4/preguntas_y_respuestas_del_cuento_el_hijo_de_horacio_quiroga.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d37cc49b-45a6-4b64-aa02-b4bad4986a1a/data_structures_and_algorithms_in_java_6th_edition.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2b3e90c3-38ee-467a-a3ef-cf427c25fe3a/what_is_hydroelectric_power_advantages_and_disadvantages.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c87c8124-358a-4616-9642-ea2d0035bd16/sosotunagutuwifopeje.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c46cf282-0c99-4e4a-bc9a-e4c4a919cd1e/bawotugejirelu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/74b507f6-0ea7-4a2b-af1e-b5b54a8d3b74/how_to_use_the_black_and_decker_air_fryer.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/18521c99-96fe-446d-9811-3a12d8ac3fce/lasafutugodenamirop.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/27569ba3-d3b2-4f01-87be-308f34124445/98556601470.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_off0000f458.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF458	5036 bytes
SHA-256: `181b8b58da5adfdada650d41578ee05046cf34edcfcf0cb0a83d8a29b6165f90`
`font_01_sfnt_off00010571.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10571	10984 bytes
SHA-256: `146b5a36c268bf5e5ca3fb70c695bb6d5777ce92a3795d9cae536839b3b76df7`
`font_02_sfnt_off00012adf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ADF	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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