PDF malware analysis — malicious · 2ed276536b76983b

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 05:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: a71271038bcf9c82fe914c85c16934b7 SHA-1: 782089662e1704b9b5dd1afebcdf75ddc11b8f35 SHA-256: 2ed276536b76983b36a3b3f770fdbd951d7fa49bab16b3fe21004984eee35464

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to 'Ap statistics chapter 3 test 3c answer key'. Numerous external URLs are embedded, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=ap+statistics+chapter+3+test+3c+answer+key PDF link annotation
- https://cdn-cms.f-static.net/uploads/4411683/normal_5fe629606a5e5.pdfIn PDF document text
- http://zitokujamu.mypressonline.com/64792067930.pdfIn PDF document text
- http://tesekal.mygamesonline.org/astro_medicine.pdfIn PDF document text
- http://taher-tcac.com/best_clean_dance_musicpu4ol.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478946/normal_5ff772efd9c01.pdfIn PDF document text
- http://bulakirip.getenjoyment.net/divergent_download_in_tamilyogi.pdfIn PDF document text
- http://datab.vip/milanafabegifeposubuxod685xs.pdfIn PDF document text
- http://difozoxezepi.getenjoyment.net/nxp_investor_day.pdfIn PDF document text
- http://beststudent.space/35955604112exk2s.pdfIn PDF document text
- https://cdn.sqhk.co/lopijikuvi/bguZjRL/fuzexuxiparek.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473640/normal_603025d840d84.pdfIn PDF document text
- https://cdn.sqhk.co/jesupasuzoku/zhe9vrE/harvard_business_review_books_2020.pdfIn PDF document text
- http://tuzevijubozor.mywebcommunity.org/21586175824.pdfIn PDF document text
- http://lofitner.buzz/treatment_guidelines_for_myasthenia_gravisrn51w.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4411691/normal_5ff1cfdf20ed9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453540/normal_600a3b064a981.pdfIn PDF document text
- https://cdn.sqhk.co/kekelivig/Zgc5gfb/tinevuk.pdfIn PDF document text
- https://cdn.sqhk.co/gojinuma/gg1Mjbq/kabavowitobafuvezit.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_d299dc0d0ceb4434a9ff668260af4148.pdf?index=trueIn PDF document text
- http://sitafefisoju.atwebpages.com/20719814276.pdfIn PDF document text
- https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_9b41e50600d94194abeebe9af358c218.pdf?index=trueIn PDF document text
- http://zegiwewezenaro.myartsonline.com/mujenekasunilo.pdfIn PDF document text
- http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.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_off0000ee43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE43	5400 bytes
SHA-256: `d03fbbf62a419ad72e57ee7e1ca41b45befb308ed099b1bb12e99f6a611ffde9`
`font_01_sfnt_off000100b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100B7	11756 bytes
SHA-256: `c501f855f83ea1bcd1dc310f45bee2ddce9ce5d1c9fbb20717142f2cf97c58d7`
`font_02_sfnt_off0001290b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1290B	16152 bytes
SHA-256: `330a01acb4afc44dfe16636b5433e7c0597a130f0646190e3500e8e49a1dc06a`

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