PDF malware analysis — malicious · 8b255c055a48506f

MALICIOUS

PDF

85.1 KB Created: 2021-02-19 02:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 96ab3c0db41a8a303a533283c3628f6f SHA-1: 9dbe4b36509c8066dd6c33b0b7e88e84f27d4ccf SHA-256: 8b255c055a48506f242abe63683acd7153f493eb7f1e43b9753ec698445c482c

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'quadrilaterals worksheet answer key', suggesting a lure to disguise the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/wix?keyword=quadrilaterals+worksheet+answer+key In PDF document text
- http://dujaliz.iblogger.org/esma_remuneration_guidelines_aifmd_2013.pdfIn PDF document text
- http://fuvunopulo.22web.org/t-fal_optigrill_manual.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4488842/normal_5fc60354946fe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409118/normal_6023d545b1246.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4500444/normal_5fed07bcaba11.pdfIn PDF document text
- http://limons.space/financial_statement_version_report_in_sap_tcodepirjf.pdfIn PDF document text
- https://cdn.sqhk.co/zetarizelub/hMgfhfJ/lidaxadugejulos.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452374/normal_5fdab6cd1dc25.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380523/normal_5fd1a2ac34ea0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461773/normal_5fdf55598431b.pdfIn PDF document text
- https://cdn.sqhk.co/zidulibu/ibdhiih/dungeon_keeper_4_gameplay.pdfIn PDF document text
- https://cdn.sqhk.co/xefijumu/ijjCA3f/sesepumimefabavalog.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393197/normal_6000fe6a8a958.pdfIn PDF document text
- http://wow50.pro/avatharam_2019_songs_isaiminiux1zg.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426066/normal_602a41f7ea657.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4476578/normal_5fdc956ea30c0.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/wipotegadodorek/moves_like_jagger_sheet_music.pdfIn PDF document text
- https://s3.amazonaws.com/xeponodij/11752997622.pdfIn PDF document text
- http://buketoxepebaf.epizy.com/ghatanji_weather_report.pdfIn PDF document text
- https://s3.amazonaws.com/dezajok/virexivodanugiloma.pdfIn PDF document text
- http://dikawixum.epizy.com/muzuzameralonun.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_off0000f14a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF14A	5232 bytes
SHA-256: `697d782afbd8ecfdc28576d0a6e1c25a29b508aa40b90f0f56738640bc822b2e`
`font_01_sfnt_off00010324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10324	14916 bytes
SHA-256: `3c6c07b9e2dfdf010f0604af28575806527737496a9ee2eeffe9e435f3185af0`
`font_02_sfnt_off000131ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131ED	16100 bytes
SHA-256: `059b347b535315f8f1c93467b8b0160e93c5d8757e09f77e3721aefcf50e4c29`

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