Malicious PDF — malware analysis report

Static analysis result for SHA-256 077e1b018ff10797…

MALICIOUS

PDF

75.5 KB Created: 2021-02-27 00:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3dca4c80532e32db4972c34ac2e8ed69 SHA-1: ee9864ce63d3cd7dc491e10a81efc112d7b98ec8 SHA-256: 077e1b018ff1079732b412e77fb2353157041a01455714c715962e12cf070c2e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link, 'https://ponafet.ru/award?keyword=d-link+dsl-2750u+software+update+download', indicates a lure related to software updates. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ponafet.ru/award?keyword=d-link+dsl-2750u+software+update+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fe7c0f807c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_601fd2e5ae7b3.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/17f930e81e610.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/xuvizate.pdfIn PDF document text
    • https://jelaxatibepa.weebly.com/uploads/1/3/2/6/132681396/wizetud.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/vokuguxovuzuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_601df8645e6ee.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/wozaj_mapixum_gewosopuzuliw_nedek.pdfIn PDF document text
    • http://lejuxetuvi.iblogger.org/tigipaxulutiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_6009069cc57b7.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/8406014.pdfIn PDF document text
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/zijelopefemotu.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/mubemutolewe/35420574045.pdfIn PDF document text
    • http://zejenideve.rf.gd/fibiso.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/mefumedame.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/loctite_5510_technical_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/55425699263.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/bipakalesapuxoli.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/netflix_shows_onto_laptop.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5700 bytes
SHA-256: e69d2d6e35c887b7df632e334e80728d0bf5558f176bbb35616b4d21c686f5f8
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10276 bytes
SHA-256: 616b0f7dbe005254f1b05b238ec1712baa8e7f221ead02f0c49d7193e75abc6b

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