PDF malware analysis — malicious · 553eda61ca60d8df

MALICIOUS

PDF

73.4 KB Created: 2021-01-15 07:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02

MD5: 98e57a91005537fccbedc969978429f8 SHA-1: ee8887eaab14e93c61e938e49fa90316863710e6 SHA-256: 553eda61ca60d8df386ab8825b02615a310b91db61f1be6d80eb8a3a6e6e7613

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

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://traffnew.ru/aws?utm_term=asphalt+8+airborne+free++uptodown PDF link annotation
- https://cdn.sqhk.co/jepipovi/ijcpBiD/top_albums_2020_billboard.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403140/normal_5fc5caef8f8d9.pdfIn PDF document text
- https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/juzikizizimezez.pdfIn PDF document text
- https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/jopurexe.pdfIn PDF document text
- https://ruworelolovifuf.weebly.com/uploads/1/3/4/4/134462917/cde07cff352c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/magapeguwabe/soft_contact_lenses_for_keratoconus_case_report.pdfIn PDF document text
- https://s3.amazonaws.com/xoguwavosuje/zofibiv.pdfIn PDF document text
- https://s3.amazonaws.com/zolerazowubow/pedegevazapixupet.pdfIn PDF document text
- https://s3.amazonaws.com/dazemi/tilevawi.pdfIn PDF document text
- https://s3.amazonaws.com/poresi/60203944879.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_off0000e108.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE108	5544 bytes
SHA-256: `16f0e49a941ef91751e88cdb7f20dcc9f56e36646d1281e80f8def4aa320ac48`
`font_01_sfnt_off0000f3e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E8	11056 bytes
SHA-256: `65034b81acf5ab10fd64f824e87590efede72c7ed32f3b9993828c85f38335ca`

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