Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69688810a01f25…

MALICIOUS

PDF

86.0 KB Created: 2021-03-31 06:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8d5e6b992649de0f567d3f69b73e577 SHA-1: 073f35f8d90f6a1841258dda2ea435589581f6a6 SHA-256: ef69688810a01f257e511ab066e6712f2d0cc4a9428fd264a23b7879d7e3ccaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as relevant search results or document titles, indicating a link farm for SEO spam or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://resalured.ru/wix?keyword=kenmore+he3t+washer+parts+manual PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/6cf5b31a.pdfIn PDF document text
    • http://premial.su/36900321253qkaim.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/BgdCjeM/one_gun_2_stickman.pdfIn PDF document text
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/mevifosoni.pdfIn PDF document text
    • http://mihetos.xyz/wuzamokotupogudezubigaebo05.pdfIn PDF document text
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/7ad6fcf.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/833f4359e.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/jchbQR4/pocket_little_pony_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/fjcncid/59642743054.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/gutebumed.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/hjjajhd/xenerozubunamirelezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_ae3571dd74c64e1da74776908beb70f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/how_to_prepare_for_quant_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/16615288165.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_72db81b36b24497cb5cee83d3c303f38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/medekonasanufe.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_568c361a01484782a5015b4ace2792f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/ms_dynamics_ax_interview_questions_and_answers.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_1ca732d15c694189b7340479888a01bd.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_66e2feb575cc4aa2b00b5dbb77d0ab50.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_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 5284 bytes
SHA-256: ab38f4ceecf605510f702e2617dbb8e879ef305a16c45ddceff92ec61aa093ea
font_01_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 12264 bytes
SHA-256: 9054945060b169c98cd42f8237ea34275ce0b4192f2789176e14d13096446350

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