Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f841b588c50200…

MALICIOUS

PDF

74.9 KB Created: 2021-05-02 19:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2de3f4faf99f59425734680e4a7f50db SHA-1: 78d6f75878c4731cdbb8cac47063c821861b2dbd SHA-256: b2f841b588c50200e9637b2deae59379b4008be43a1cc464b55e1b4d5bcd78d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. The presence of embedded URLs further supports this, although no specific script was extracted to detail its execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=how+do+i+fix+error+e5+on+accu+chek PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6060815d18906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60107afba7dbc.pdfIn PDF document text
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/6c6105d85fb.pdfIn PDF document text
    • http://prognoz-football.club/704878942963kway.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421224/normal_5ffeb3962d3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60602fab2711a.pdfIn PDF document text
    • http://norasidifonilov.22web.org/jusizivigepegub.pdfIn PDF document text
    • http://igcopyrightverify.com/74527912064qzuoz.pdfIn PDF document text
    • http://verifybadgehelp.com/tarodedefegesegukiliso35eah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_605ca225e1114.pdfIn PDF document text
    • https://velelamoju.weebly.com/uploads/1/3/1/4/131438442/4198147.pdfIn PDF document text
    • https://gazuxajolitivik.weebly.com/uploads/1/3/4/7/134770387/6cdeab77316c859.pdfIn PDF document text
    • http://slmit.space/16321680340yscen.pdfIn PDF document text
    • http://freefire-gifts.com/kirby_sentria_2_reviewstd89d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_ad3c892a8ed246c5926247af96704cd4.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_21ef7471a15d4820a794a5b4611a1fb4.pdf?index=trueIn PDF document text
    • http://pedijuwugeta.rf.gd/ugly_betty_book_series.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_a0431239e98048e0a37edce97a3b7469.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_b1ee97c3edef4c28b1bd306d5a019dc1.pdf?index=trueIn PDF document text
    • http://jijujubebepo.rf.gd/albizia_gummifera.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_1bd177d63f5d400284cf87cd5e9cae7a.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_9f55a9ebdc2f4d55be496b983b32ae50.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_0b431bed4ace47bb85c6c574170d0459.pdf?index=trueIn PDF document text
    • http://godemesefiw.epizy.com/bedding_sheet_size_chart.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 5208 bytes
SHA-256: e7cd3f7f3f4f22ded59651b57c07b02d2b7cf330dc26825dd32ffd4312588fef
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 10432 bytes
SHA-256: c632dbaf1e193a540aa8487742fe83a862d4c4498ffc8cbe92591f68f8d1a4a9