PDF malware analysis — malicious · 4482ba538c9d766d

MALICIOUS

PDF

81.6 KB Created: 2021-05-21 10:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 291d69be5b79752299222a6c4e773d7e SHA-1: 58671d9899717be1055f19aad9647e01be9cd4cb SHA-256: 4482ba538c9d766d99c610e80a5dffc05113a4e7272c595f74df20147791c300

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://vilenefex.ru/strik?utm_term=super+robot+wars+alpha+gaiden+english+patched PDF link annotation
- https://cdn-cms.f-static.net/uploads/4408706/normal_6040e7f67db0f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375703/normal_5fff29719af9e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469374/normal_603226efae0eb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4529024/normal_601dbc1542e21.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481270/normal_601bf8f8e5c3c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377120/normal_601600e1b42eb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367268/normal_605cafa2b6d80.pdfIn PDF document text
- https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/8172478.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369646/normal_602cf8e8d2fd9.pdfIn PDF document text
- https://daworotiboxega.weebly.com/uploads/1/3/0/7/130775949/9229530.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4498842/normal_60073ea0defda.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/gudukupir/best_innisfree_sheet_mask_for_dry_skin.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/07effb07-b3b3-42a4-ada5-1880105975a2/10753691071.pdfIn PDF document text
- https://s3.amazonaws.com/xazarujokemus/eba_guidelines_outsourcing_register.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c2b79f5e-7e83-4c91-9d2f-4e1733e38867/37373457892.pdfIn PDF document text
- https://s3.amazonaws.com/kijelopazekune/mossberg_930_spx_reviews.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_off0000e668.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE668	5156 bytes
SHA-256: `370498f12758c22ec261c7c2bdcb76611310df8190190a825056496d4dad34bc`
`font_01_sfnt_off0000f873.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF873	5668 bytes
SHA-256: `b05ac7c3c00841f638bf2a941601af4fae23984cfff788cc160b3366b0707771`
`font_02_sfnt_off00010bbd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BBD	14276 bytes
SHA-256: `02c3e8d6942762c79eed2aed783aaec0a28ab9b7f5f5247e33c88650930439ff`

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