PDF malware analysis — malicious · 3936aa9cadbbfbd3

MALICIOUS

PDF

83.0 KB Created: 2021-05-25 13:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: fd01e4793a2f4f50c419714bb2d7112d SHA-1: 2debfa447069ea8d1971aa277e74f2c1a2d2aa8e SHA-256: 3936aa9cadbbfbd354151769214a7a33fad49ae35bfd5bf7b8fd2bf1816b0841

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious destinations. The primary URL, https://mezovuduw.ru/strik, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=wortarten+bestimmen+arbeitsbl%25C3%25A4tter+mit+l%25C3%25B6sungen+6.+klasse+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4421061/normal_5ff36fb5ad600.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388037/normal_5fd9d5ea91f59.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4499283/normal_602c34c61057c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369655/normal_6000c57cd250c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424036/normal_5fe7b0f0b1ec8.pdfIn PDF document text
- https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/nuveposuwoxi_luzukumeledipu_rufopigi_mepametuf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4410722/normal_5fcf5b30017ba.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489404/normal_60232bcb53c65.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376600/normal_6012ddfc986c7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4486552/normal_5ffaa14cba083.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392660/normal_5fe152f53f6d1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392195/normal_604854002b242.pdfIn PDF document text
- https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/1710164.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404515/normal_60144b9314d36.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/ritoma/tetodewuratavelelurovigu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/629bbf1a-df45-4dfa-bc7a-c5485fc4eca8/97372185349.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6adf8966-1c9a-45ad-893f-9a33cd181d39/16347918754.pdfIn PDF document text
- https://s3.amazonaws.com/kotodur/fundamental_chemistry_book_free.pdfIn PDF document text
- https://s3.amazonaws.com/kavifunaruvi/abranet_sanding_screen_sheets.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/24b6d67b-e99d-4235-b920-6df229a6a640/mexafevisademir.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/79662b4e-1e69-494a-889b-ba56f1e298cc/74219572997.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/769c7262-0520-43fc-aeba-9aaecfb30843/fugebidodi.pdfIn PDF document text
- https://s3.amazonaws.com/tamobalasu/69643565198.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_off0000eaba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEABA	6136 bytes
SHA-256: `fe28af9603269853d0fd4f119eaa98f105d749a2fb1df3c34a350bdee1062e6d`
`font_01_sfnt_off0000fec3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC3	11716 bytes
SHA-256: `aae894cbf9303a0fa76a98aff94c84c30f5b9bdd1b5fa816daf4ba7efe6fb8ec`
`font_02_sfnt_off0001255d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1255D	16204 bytes
SHA-256: `532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e`

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