PDF malware analysis — malicious · c0ecb6f1458c0fe1

MALICIOUS

PDF

122.8 KB Created: 2021-03-25 05:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 0f87b9b1bb556b11b62157c5951f58a1 SHA-1: b3d6b229a362b41c267c3637390c0070fb79cbf9 SHA-256: c0ecb6f1458c0fe17a1515b33ef716b09a4230b2594cfd2a9b26a45c51c7a5ac

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract traffic via SEO terms like 'chess titans windows 10 free'. The primary external URI points to a URL with similar SEO-related parameters, suggesting a lure to download or view malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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 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=chess+titans+windows+10++free PDF link annotation
- https://static.s123-cdn-static.com/uploads/4417030/normal_5ffd0fc14c268.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4483349/normal_5fc9db20cf2ae.pdfIn PDF document text
- http://blankid.ru/905828687046lw1v.pdfIn PDF document text
- https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/nonobuwodis.pdfIn PDF document text
- http://microbladingcertificationdfw.org/best_class_to_play_eso_2020itlgr.pdfIn PDF document text
- http://natgood.space/68262490689cst81.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390323/normal_601b102ca230e.pdfIn PDF document text
- http://startask.ru/dell_1610hd_user_manual17jto.pdfIn PDF document text
- http://otomail.business/watchos_6_beta_8929an.pdfIn PDF document text
- http://the-english-temple.com/vurezebibagatopukok6ils2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451025/normal_603c603908aac.pdfIn PDF document text
- https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/268877.pdfIn PDF document text
- http://creditstar-kabinet.com/matlab_programming_textbookybikx.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379742/normal_60267bd2ce05f.pdfIn PDF document text
- http://kinorio5.xyz/81719876519ps9mi.pdfIn PDF document text
- http://znasila.ru/crehana_vs_domestikazpn7c.pdfIn PDF document text
- http://nicepics.xyz/determining_dependent_and_independent_events_worksheet_answerslpidt.pdfIn PDF document text
- http://uscarinsurance.info/heme_bilirubin_formationnjsvo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478438/normal_5fcae53d2975c.pdfIn PDF document text
- https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/fedawo_negigifawolu_wupetakeli.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404503/normal_5fe44e2431dcb.pdfIn PDF document text
- http://steblin.pro/why_a_washing_machine_wont_spin6t7mb.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010247.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10247	46472 bytes
SHA-256: `5c41ac64466524dee5b949de2f5f9c5baaa9d556547e50fd654555c113fa8f69`
`font_01_sfnt_off0001901d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1901D	5156 bytes
SHA-256: `ee9785f2dbad09351c8922848083ca86a10e0432c38933b3d21c970c9bd6a093`
`font_02_sfnt_off0001a1af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A1AF	11092 bytes
SHA-256: `432281df852bd3afaf3b38eb7738a411d1bf796330dc65be9ccc55654ae137f8`
`font_03_sfnt_off0001c77e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C77E	16252 bytes
SHA-256: `b31eed6f3373c4784ed9897658b408b87cc391305637cb5cf42be240bf533ea8`

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