PDF malware analysis — malicious · 31c52ef24425b9a4

MALICIOUS

PDF

100.0 KB Created: 2021-06-04 01:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 023dd2250582a2d408ab00e612b556e7 SHA-1: 9edd61134c6f079e29656d2b41277427067a728d SHA-256: 31c52ef24425b9a4b09986bff1bdf941f08d65756470d53b6f44ecc2f4b6a3bf

186 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 0.9996

Heuristics 6

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.
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.
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://xajibur.ru/123?utm_term=apex+launcher+apk++free PDF link annotation
- https://cdn-cms.f-static.net/uploads/4383582/normal_603625a7a2a12.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376602/normal_60527bd8b3c6c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374954/normal_5fd9a1eead503.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450353/normal_600dcda0f1337.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417813/normal_5fc915c566f0a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465402/normal_6015c6e31eaa4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468296/normal_60b94d3345424.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454546/normal_5fd2c87b88ab4.pdfIn PDF document text
- https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/839119.pdfIn PDF document text
- https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/45a1b09.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403822/normal_600dcd54d3dbf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4493541/normal_5fcbbb3503f74.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474218/normal_6035a65a0338d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fepewuwakow.pbworks.com/f/when_was_the_first_jail.pdfIn PDF document text
- http://kusarolox.pbworks.com/f/vavodelikozosegepozam.pdfIn PDF document text
- http://neruwuk.pbworks.com/f/blockman_go_hack_apk_2020_unlimited_cubes_download.pdfIn PDF document text
- http://natizasex.pbworks.com/w/file/fetch/144578613/77863569307.pdfIn PDF document text
- http://doxawadar.pbworks.com/w/file/fetch/144513276/lixat.pdfIn PDF document text
- http://wuxikadafi.pbworks.com/f/how_to_hack_with_kali_linux_2020.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000103af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103AF	5044 bytes
SHA-256: `2693855ad7eceee5e63195143f3c40a563b58b4300b95b26538f5d5fa69784d6`
`font_01_sfnt_off000114d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114D3	11664 bytes
SHA-256: `da1739cb02b159ae6df5cfaec1f8ca00d9c5d4bacb1f3a82cbf71c51c755bc99`
`font_02_sfnt_off00013af8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AF8	14464 bytes
SHA-256: `46bb1410e23819aeb148b76485ce4d72f96c730dc6398a98b6c74cce744e7d6e`
`font_03_sfnt_off00016895.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16895	16820 bytes
SHA-256: `a36110ca816e8c164108bbf7537a4a3f0da197c5f9eb2c6304175e2199f5e69d`

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