Malicious PDF — malware analysis report

Static analysis result for SHA-256 5602f7d1b2589869…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 22:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dce6fb455ff742b69880c1afb2c9c3fd SHA-1: ee74a0c133c1f49a57605b375fd22b41a248f768 SHA-256: 5602f7d1b258986907188c9954debd8bef7684b43f41837b32e09184610cde0a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, suggesting a link farm or redirection scheme. The embedded URL `https://gimoguvi.ru/123?utm_term=vaastav+movie+song++pk` is likely part of this scheme. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content, aligning with spearphishing tactics.

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
  • 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.
  • 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/123?utm_term=vaastav+movie+song++pk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424330/normal_60481e1f275e7.pdfIn PDF document text
    • http://kmikaerfs.ru/pukaxupupwaw.pdfIn PDF document text
    • http://ubsvp.com/83676712916nv1ri.pdfIn PDF document text
    • https://jadivamanug.weebly.com/uploads/1/3/4/8/134868371/4380818.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/lijefajevok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_601e514347968.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/tedaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_604071456c886.pdfIn PDF document text
    • https://xojunujad.weebly.com/uploads/1/3/1/1/131164104/9263054.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/wupuxus/prince_of_persia_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/naza_m_lite_to_v2_firmware_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/critical_ops_no_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/41563211969.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/59789967942.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/attachment_styles_test.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/26733281990.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/phases_of_the_moon_printable_worksheets.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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 5100 bytes
SHA-256: 6a8c39dad9439928da9572b00cf0894ef284305df507887e3d693ca1330a503d
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 11080 bytes
SHA-256: d91b6c022301c1fc4323fbdeeadea3c5f51d06f1d7323ba74ecfd2d7011adf43

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