Malicious PDF — malware analysis report

Static analysis result for SHA-256 718afc5c3126ec97…

MALICIOUS

PDF

83.7 KB Created: 2021-03-30 16:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ce88db6351bea62079e8289260b1ec SHA-1: 28e00439167162b469478b0be5e8e3eb43dacf48 SHA-256: 718afc5c3126ec972a1f3a4e24fe151bd473057425479249931f6a1e9f53c8dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://maypoin.ru/wix?keyword=used+dog+boxes+for+trucks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=used+dog+boxes+for+trucks
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/6553330.pdf
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/tinabaga-wunevedomuwof.pdf
    • https://witatubaf.weebly.com/uploads/1/3/1/6/131606367/mobasidokug.pdf
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5ff9ce7e53c6c.pdf
    • https://cdn-cms.f-static.net/uploads/4492574/normal_600a557e252f5.pdf
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5ffc9f16496ae.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/jarebikesotajip.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_6055be0f19427.pdf
    • http://tediwaxivuj.sportsontheweb.net/46207863878.pdf
    • https://bixolajulepu.weebly.com/uploads/1/3/4/7/134746591/8565742.pdf
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fce06dcc4453.pdf
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/a3d73d933af.pdf
    • http://rumepado.mypressonline.com/wings_of_fire_book_in_telugu_download.pdf
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/kalatenujem-kabajugu-pezumexo-dazoviposo.pdf
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/xitit.pdf
    • https://nebilewanowuz.weebly.com/uploads/1/3/6/0/136083660/f41d5fd.pdf
    • http://pagavopalubutu.scienceontheweb.net/systems_of_equations_and_inequalities_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_0caba59c1b094551b27197c4b5625f25.pdf?index=true
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_39c46d4ae1fc43cdb9e7e97ba5dbd254.pdf?index=true
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_959f552f5246497e805abbc13db4a134.pdf?index=true
    • http://kubomefewofumim.atwebpages.com/xeluzolixo.pdf
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_7e7cc5a1b7944865974d81beb6a6bc1b.pdf?index=true
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_0266104c9512462c8d01948acc68c230.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_e49888c00b3b4c8dbd3f241db7fba8ce.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_fdd0c0a5ccae44fdba4e0620f82e8828.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_b287572e7f934fbea9c9914dcca99f04.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd3.bin
6b657d2cd8b37d4484754c15d3fd8a2139323b4f09a3d3c5763362ec5331c4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 4940 bytes
font_01_sfnt_off00010cc3.bin
2a8ea4101ca1e7bd89ffa0ba4bd61437846d23b2d06ac21429a582d0c7075e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 10992 bytes
font_02_sfnt_off0001326e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 4324 bytes

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