Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d3ffa7b184c53…

MALICIOUS

PDF

79.0 KB Created: 2021-03-26 01:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cb239e3081027709533e43f0ea573a56 SHA-1: 772a57accae44d540ccab8daf75e74e9412f47d2 SHA-256: 237d3ffa7b184c534189f76f58e0b7f9eb390b87b81efa23c5f47125d562bae2
104 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URI pointing to 'leonvi.ru' and a heuristic for a visual download button suggests a phishing or social engineering attack. No scripts were extracted, but the overall structure and external URL point towards a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=genie+powerlift+900+remote+reset PDF link annotation
    • http://odemebayisitrafik.com/xemesiwosikevizimiltoga5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5fe66f24bc746.pdfIn PDF document text
    • http://klosheff.xyz/xajixudowuxevuguwedaturdv347.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/what_does_kou_mean_in_chinese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff60e31bc8a6.pdfIn PDF document text
    • http://study-english-04.space/la_verdad_sobre_el_caso_savolta_onli5m4tg.pdfIn PDF document text
    • http://www19216801.site/billboard_advertising_contract_templatent4lb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_604e41599db0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5fe0447f24b9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e94ed8-1f47-4ce5-935c-0e496d4ad2e8/cabinet_vision_8_crack_download.pdfIn PDF document text
    • http://nidubopavoxu.rf.gd/91107310245.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/kipafazividafux.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/88889932315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f55ee2-7cf7-410d-9e7d-d34057661a8a/can_you_cook_frozen_baked_ziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f4436a-0e9c-42d5-b304-25ae99972953/61451363525.pdfIn PDF document text
    • http://poluluzu.epizy.com/zajaxewivi.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/gta_san_andreas_cheats_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/xuzijuwam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d915ae4-fb2e-4d18-85ee-5b5e4f8494b6/should_i_buy_a_wii_u_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/masters_of_the_universe_2021_voice_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/16699305106.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_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 5256 bytes
SHA-256: ff8488ff67edc3d74f3f06cc537e581fd004a6f0693bcfbaffe0b121a63a342b
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 11524 bytes
SHA-256: c82862083c9308292927fab23f2d111707b56de023209d0430499bf84d21addb

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