PDF malware analysis — malicious · a6d4fcd646a5ebb7

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 23:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 8dacce781754aba7fb15b5eae714ce73 SHA-1: 52795f7a183ee62b8f23d25f58cd7aeda0afe4f8 SHA-256: a6d4fcd646a5ebb750e49da61b9051096ace4b2b08bd040683abc32cf134d910

196 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. It uses a LOLBin command-execution lure. 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-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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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://baarspo.ru/123?utm_term=letter+formation+practice+sheet+free PDF link annotation
- https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/diburibi.pdfIn PDF document text
- https://cdn.sqhk.co/jeporikate/bigieic/kovebojigerawiwunusoma.pdfIn PDF document text
- http://itasda.online/697580185648sucu.pdfIn PDF document text
- http://bio-ita.fun/curly_hair_worksheets1e11.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459034/normal_5ffaf13202ee7.pdfIn PDF document text
- https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/foladevene.pdfIn macro / runtime command snippet
- https://cdn-cms.f-static.net/uploads/4367665/normal_602ed07cabaf4.pdfIn PDF document text
- http://devlp.club/dusk_till_dawn_tarantino_trailerkm2zp.pdfIn PDF document text
- http://bcpzonasegura10beta-viabcp.com/se_ha_perdido_el_pueblo_mexicatl_resumenn9p8i.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4385216/normal_5ffa6249e71ad.pdfIn PDF document text
- https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/5062588.pdfIn PDF document text
- https://pawunotapi.weebly.com/uploads/1/3/1/4/131408062/zipebovibubobef_wupiniruduvipej_barufi.pdfIn PDF document text
- https://cdn.sqhk.co/madufuxenuw/6SheASP/34572544908.pdfIn PDF document text
- https://static.s123-cdn-staticIn macro / runtime command snippet
- 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://s3.amazonaws.com/voxazedisula/botifomo.pdfIn PDF document text
- https://s3.amazonaws.com/xewamejixolefaj/waterpik_ultra_water_flosser_aquarius.pdfIn PDF document text
- https://s3.amazonaws.com/megodipewukitoj/the_witcher_audiobooks_in_order.pdfIn PDF document text
- https://s3.amazonaws.com/jezaxojipevu/nubexoka.pdfIn PDF document text
- https://s3.amazonaws.com/mefadedosuw/iwmp_common_guidelines_2008.pdfIn PDF document text
- https://s3.amazonaws.com/setaxilitozuko/2773137425.pdfIn PDF document text
- https://s3.amazonaws.com/davolazupivowi/34327040375.pdfIn PDF document text
- https://s3.amazonaws.com/wanasuvedigo/jonufarabuwur.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_off0000e4d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D0	4952 bytes
SHA-256: `ac3811e0013e23ed92ae59fd5162b78ff5fdc710890fbc8404010591226616c3`
`font_01_sfnt_off0000f569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF569	10584 bytes
SHA-256: `6d308cd28c93c6fabc626b285ca44344c8b8e65e96bbb969a2304e42275ff87e`
`font_02_sfnt_off000119a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119A1	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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