PDF malware analysis — malicious · d44225872f024d66

MALICIOUS

PDF

72.3 KB Created: 2021-04-04 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: a45e520dd96837f9a1e3e49cad354b82 SHA-1: 553ff9dbdf91a285c7227f9f36ff664ceaa02d3d SHA-256: d44225872f024d663f29d7d230b340e79390e87eb0bbaf2998761e69c5f2d29d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'baarspo.ru', which is likely used to host a phishing page or distribute further malware. The PDF structure and embedded content suggest an attempt to deceive the user into visiting this external resource.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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
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://baarspo.ru/award?keyword=agenda+escolar+2020+a+2020+preescolar+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4385848/normal_5fdf7213e6697.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447097/normal_6063ab85693b4.pdfIn PDF document text
- http://butalinonoruma.scienceontheweb.net/cell_cycle_cdks_and_cancer_a_changing_paradigm.pdfIn PDF document text
- http://xorabawik.medianewsonline.com/cardigan_sewing_pattern.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486963/normal_6038d5b550518.pdfIn PDF document text
- http://sponsor.rest/jump_zombie_chapter_250mz49.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4496372/normal_605066f172226.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473375/normal_60264ed416df8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454558/normal_60302448d328d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391001/normal_603531e2718c4.pdfIn PDF document text
- http://smeshnoykir.space/witezufavasixadesab0e3mu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415962/normal_60125e00b9983.pdfIn PDF document text
- http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
- http://sokfresh.fun/zamikizojugezazobadexofadrw4l.pdfIn PDF document text
- http://kernig.online/punctuation_worksheets_9th_gradem9p45.pdfIn PDF document text
- http://nepatokada.mypressonline.com/tales_from_the_loop_art_book.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
- https://uploads.strikinglycdn.com/files/776f905c-5ad1-4a22-a165-3fff3f4b41cf/what_my_car_is_worth_in_blue_book.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b2dd0268-c09e-477b-81ea-c16b5d686edc/what_is_meaning_of_islam_in_urdu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1a48c7f5-a404-4911-9dfb-f3f9221904df/where_is_the_ir_sensor_on_samsung_smart_tv.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a9efc0c4-e169-40ce-8570-bec887d63f41/bofupevogaxezeke.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/06bb8645-0246-4f42-a429-33f37f69fa1f/how_do_i_become_a_certified_icf_coach.pdfIn PDF document text
- http://kogotiru.myartsonline.com/59768681501.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_off0000cd58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD58	5244 bytes
SHA-256: `96ca83e08c4834b4b74b0fd36d7d2a95148636e16e6e9f77cc2dd5276acb9be7`
`font_01_sfnt_off0000df2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF2C	11268 bytes
SHA-256: `e8090d250db77d9cbd59ade1c2c80c7eb1a8b94222824cbac134c340b1767ae6`
`font_02_sfnt_off000103ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103AD	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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