Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b967a33f9f2768…

MALICIOUS

PDF

88.8 KB Created: 2021-04-09 23:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 876256a847000131d693fd040a21a9c0 SHA-1: 2825822286b2fa572ed88c61ec82ca671dfd575d SHA-256: 99b967a33f9f2768715578e8c0d17bb987a24198db68c46489e1a06006e628f2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=big+little+lies+season+2+episode+7+ending+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5fc801b1a3d15.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/sizebevufanepe.pdfIn PDF document text
    • http://moymagazin.xyz/how_much_oil_goes_in_a_honda_power_washerhnlo8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_600c12e2c799a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_602dab7ea45d7.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/6618488785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5fe672452724f.pdfIn PDF document text
    • http://cuzinfo.ru/coda_meaning_in_simple_englishur1pm.pdfIn PDF document text
    • http://beguwidip.scienceontheweb.net/cahier_de_vacances_gratuit_a_imprimer_4eme_3eme.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/dibujos_para_imprimir_y_colorear_frozen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_605070b3d2fdf.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/domodenurojogijemafogaji.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://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_2aa9a4a1a2de49df9140617cf547488f.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_ad0c57a700c84a93843897259abc5b4d.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_dd0dc171aa04429db5c9155c44be0c04.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_a9d5d1ed964f47bc8a2733fa3567b570.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_29bcb5b5ec1846f19abe532939cf938d.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_41378a2f40ae43c1b0fdb05e690017e4.pdf?index=trueIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_4c6a8816cd90462892a8ef073311be4a.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_cf7b583eefcb4f7ea3e6b7e05f44e927.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5080 bytes
SHA-256: 1abcb32da450b46b4a0bd6f2b88110bdd196b3be4d514c78f58ba4d11a410fd0
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 11880 bytes
SHA-256: 76d092f7351b0f7e913a9535bd40e58a977152cbc7b9dae5f3cce7e96ffd3419
font_02_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940
font_03_sfnt_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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