PDF malware analysis — malicious · 46119bec427c62b8

MALICIOUS

PDF

75.6 KB Created: 2021-03-10 06:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28

MD5: bcbd9d28a1f2b3230bb8469c9df4cebb SHA-1: 252ede171b9414753b98b75ccde12bade594e14b SHA-256: 46119bec427c62b8fca535012019d0272ff2837ea46c7618aacbf01b3f3aeca1

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting and a callback phishing lure. The document body, though heavily obfuscated, contains references to 'economics 4th edition paul krugman' and 'wkhtmltopdf', suggesting a potential lure related to academic or financial documents. The presence of numerous external URIs, many pointing to disposable domains, further supports a phishing or scam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://jumiwimov.ru/aws?utm_term=economics+4th+edition+paul+krugman PDF link annotation
- https://cdn-cms.f-static.net/uploads/4404500/normal_5fda82a1e375c.pdfIn PDF document text
- https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/deminogaxaparo-luxaluzow-fevenod-lasixuk.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4498345/normal_60068f34d0d62.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460950/normal_6045028ada0c0.pdfIn PDF document text
- https://cdn.sqhk.co/kuvuzebilet/pjeb6LO/drive_by_birthday_party_ideas.pdfIn PDF document text
- http://tufepuwaw.iblogger.org/free_vedic_birth_chart_analysis_report.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4483851/normal_600ccca3f23f8.pdfIn PDF document text
- http://wiinorama.fun/depexegisowufoluduxasvmcvu.pdfIn PDF document text
- http://kixetojonomezad.22web.org/android_news_apps_2018.pdfIn PDF document text
- http://nasty666.space/fantasy_world_map_templateewf86.pdfIn PDF document text
- https://cdn.sqhk.co/rowubuvuke/UjbMhe8/free_video_editor_with_music_for_iphone.pdfIn PDF document text
- https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/8820671.pdfIn PDF document text
- http://setofexperience.site/lijajobuyxv.pdfIn PDF document text
- https://cdn.sqhk.co/jusulikipe/Fjb5hiJ/lenovo_ideapad_330s-_15arr.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4486566/normal_6001f048e29f2.pdfIn PDF document text
- https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/4f92daf3c06.pdfIn PDF document text
- 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
- http://bixuxopot.epizy.com/apetito_definicion.pdfIn PDF document text
- http://fenasiwawasigi.epizy.com/37029728876.pdfIn PDF document text
- http://pijiwir.rf.gd/8958440928.pdfIn PDF document text
- http://bokakemipik.epizy.com/tuxiralol.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_off0000da49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA49	5476 bytes
SHA-256: `158e01d10b3ac56b0f7ad78dc8f959eaff232ccb272c76843bb134d5f7a07c04`
`font_01_sfnt_off0000ecb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECB8	11248 bytes
SHA-256: `3d70c32ade26fcb4e050ce378aef9f27efdb829cdabbb5319f205503c8819cf9`
`font_02_sfnt_off00011300.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11300	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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