Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a06cc1f177afd47…

MALICIOUS

PDF

79.1 KB Created: 2021-02-15 02:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 33ca756db8c44601f68b7354b0a6e2ae SHA-1: f5747c393c06f22b5e1095be82d20b1c08c14521 SHA-256: 6a06cc1f177afd472f3afdc022a9da991a95db73b33123c2816c741f2725dc22
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly-hosted PDF files, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure are consistent with techniques used to redirect users to malicious sites.

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://maypoin.ru/wix?keyword=db2+return+code+from+sqleisstoppending PDF link annotation
    • https://pokasejazutiz.weebly.com/uploads/1/3/4/4/134447431/6832194.pdfIn PDF document text
    • https://linanilutujaro.weebly.com/uploads/1/3/1/4/131453593/fibesipetogawi_vimodorawobe_fixelesofedina.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/metuv.pdfIn PDF document text
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/gokokejuje.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/lidafevevi.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/sadonemavawojuvixi.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/4129112.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/kowotupakuvimu.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/meteva_fupiwafitepew.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/luropi/gold_brick_guide_lego_marvel_superheroes.pdfIn PDF document text
    • http://fuzumonezipozut.epizy.com/continuous_present_worksheet.pdfIn PDF document text
    • http://dilowopuvuzi.rf.gd/89037223347.pdfIn PDF document text
    • http://nifubaj.rf.gd/xiwoxobibiwikizir.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/duplicate_admission_form_aiou_autumn_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/47147654475.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/conference_schedule_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/koxuxekanatubo.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_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 5664 bytes
SHA-256: 7d6537281d432c97e598122c0506df639d48d6df50c4607c03c996b21f27fc80
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10108 bytes
SHA-256: 1812d25f62169ebd6a9d907f2e8cf14ad1cfbb6e33069aecd648a0c616a69a7f

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