Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c1b19692ba27b…

MALICIOUS

PDF

109.0 KB Created: 2021-05-04 03:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e8782a0b0627e5797bde1c095a663a4 SHA-1: 14d2ae0b300d14a68db5d3bb9271df61857c0c04 SHA-256: ca1c1b19692ba27bf2f23d4df9ca77366c455ed477021e4e454d01b5debf078e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate 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 0.9851

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://botokaw.ru/strik?utm_term=what+does+wallah+mean+arabic
    • http://fastcreditreport.info/lowemimadaranosinonup5m5j.pdf
    • https://cdn-cms.f-static.net/uploads/4393638/normal_603a2c3c2f3c3.pdf
    • http://clubstore.pro/side_of_the_mountain_song12wqb.pdf
    • https://cdn.sqhk.co/gazegarov/62hjJji/ribexarilavike.pdf
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/zizopofapageli.pdf
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/4119737.pdf
    • http://vuwiwetidajin.mywebcommunity.org/jarak_dua_garis_bersilangan.pdf
    • http://trening-ekaterinodar.ru/luxikavikuzeza691sl.pdf
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/297c7eaea.pdf
    • http://e-devletturkiyeaidatsistemimgovtr.com/99773489431at7a0.pdf
    • http://fukazab.mywebcommunity.org/55664100218.pdf
    • https://cdn-cms.f-static.net/uploads/4419206/normal_606bde3db326b.pdf
    • https://cdn.sqhk.co/wajerewuwer/jgIiiOo/49948761147.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.opentle.org
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_5a5f39545cff4abeb6dceee41cf54a9c.pdf?index=true
    • http://wiwosotu.myartsonline.com/hranin_porucha_osobnosti_a_jej_lba.pdf
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_a5cd4c4062554fcbbcf95bc0dd2511fa.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_fd575f68588541dc8ccaa4e03fd5f012.pdf?index=true
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_7f78ebba51504df8bc8610f78af9380e.pdf?index=true
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_6afa40f7f98b49e6a4a90d91054cffce.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00017598.bin
aab0ea1e3dab2a22f5dfadb39b394d41b6b3fea0c4daf00793dcd536e9004491		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17598 18936 bytes
font_00_sfnt_off0000ed94.bin
d9df6945b54372b4ce1b038b385752c5e534dd56f39eb70cfae60a2504a527db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5684 bytes
font_01_sfnt_off00010170.bin
7fe1806fdc5f88c78698d614160519d8a9d93073b1195d9a72cd715fbe334965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 5424 bytes
font_02_sfnt_off000113c6.bin
dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 2656 bytes
font_03_sfnt_off00011eca.bin
864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 2328 bytes
font_04_sfnt_off00012980.bin
d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 2108 bytes
font_05_sfnt_off0001334b.bin
538512be6c526ea957b587fa229624d829dca4873b622d187784a60d2c877fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 6640 bytes
font_06_sfnt_off000144e9.bin
f56249b4495a51303bc3da1dfdb255f876267c03723ccfe92906b262ff9411ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E9 16124 bytes
font_08_sfnt_off0001950b.bin
c12c670e310cd2dd0f4b1ea6ea0d01ef35e1284caa1cfc967b978b02bd897c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1950B 3276 bytes

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