Malicious PDF — malware analysis report

Static analysis result for SHA-256 9147e6a181a8a7bc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 12:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 166b691e9ac0c8f1626094219028d1bd SHA-1: af6a1e56efeb8751ca22b73e3025568596aa75e0 SHA-256: 9147e6a181a8a7bcde1b987eaa43fe33ebd775dd13bf91a485d207b16a841cda
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests this is a tactic to distribute malware or lead users to malicious pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=politeness+principle+leech+pdf PDF link annotation
    • https://cdn.sqhk.co/foropogajag/gvT2noR/drift_war_apk_download.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/sasewavuwogi.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/p0Qvgiw/56422685067.pdfIn PDF document text
    • https://zipezeroluxufa.weebly.com/uploads/1/3/4/9/134904793/rozuruzuwumomud.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/c39c4fb.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/ijkhrgh/gesuritudonixulazava.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/45171360776.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/HhhEuhg/filobuziwokowivip.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/Ljb9ic7/rinevufu.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/79717850153.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/1237464.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/dizasevalije_busawim_ruvoragiko_tididanubamat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a24b38fa4a94440194e6bbbdb185d8ec.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_226a20aa704d4e0aba0d22ca9f66da50.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/28132141287.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f3a74a2c6aa74d6998c3cde7ed194ac3.pdf?index=trueIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_0e1106e2b82d437d93da604a02e454e2.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_90fd8b753d1c45c0b8cfcda4b69aca88.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_29b447f44eca4289b4041b5a64958c77.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_f41033d711db4772845dd05c2898e511.pdf?index=trueIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_961ee96e30ae4704a7fd635e34f908f1.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_18fabbf915b44ee9a25e89ffc3183454.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_ee80e1b6b6ff4be08a744fe32c54968f.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_029ba6bb016a4443ae41215ea867ae0c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 5036 bytes
SHA-256: 587ea9c8a58f0195ac7ff8266dd99e1f934ec9269779f7804cc48be88ca51f28
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10968 bytes
SHA-256: 289b577e8d3aeccbeb79194fb4a17f37dbb6513d4aff508c3865f630095b4fdd

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