Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7e31cab8d1b22d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 20:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0f93d7a42dda2ba1142fcd13b929e311 SHA-1: c3ded7702314d08b2c9366ce3769e05ed8ab26f6 SHA-256: 3d7e31cab8d1b22d7ec7b2c7158b90381b2032c8704a442f62623b8a1a72e98c
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically for credential phishing. The embedded URL and the action link point to domains associated with phishing lures, impersonating Instagram. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external URIs suggests an attempt to redirect the user to a malicious site for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/retojo.pdf.
  • 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://gimoguvi.ru/wb?keyword=parts%20of%20speech%20lessons%20for%205th%20grade PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/iaEXifs/47732813522.pdfIn PDF document text
    • http://bestita.space/kirilivsgprm.pdfIn PDF document text
    • http://sdfafq.info/google_account_manager_5._0_apkpurek1uv6.pdfIn PDF document text
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/retojo.pdfIn PDF document text
    • http://all-system7.club/widikirov4fxb.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/44771294117.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/hggjghh/50780603975.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/7bb8066eaec51.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/cae_practice_test_1.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/dewesar.pdfIn PDF document text
    • http://blancop.xyz/how_to_change_oil_in_a_generac_gas_generatorzurdd.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/wuporezubulimepu.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/hotel_and_catering_management.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxapoz/speed_vpn_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/workflow_template_sap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8419eb-0105-49dc-b508-3aec64991eaf/54464809249.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/telstra_check_last_answered_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231b6d3a-c4ee-4a14-8d07-12b4325698b7/25327283456.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/fugugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eee6a6e-bf5a-4c1f-9221-752f45024cda/17685058938.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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 5540 bytes
SHA-256: 681e766bee4216421f65052394dd3087af93a3c369cb835d31befff2850056df
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10640 bytes
SHA-256: 499bf1f60f49c3ce3ddee52d83263fe11b0974d9deababe424972d56e8ed3332

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