Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a335f70d8a04d7…

MALICIOUS

PDF

75.4 KB Created: 2021-02-11 08:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0d0357257c73749fe36f2f3be76aca23 SHA-1: 47a5d48fbe3db7434753d71e4ca4263622c628da SHA-256: 97a335f70d8a04d70c19426caf7d7659b5cc1cdca9b809a25fe3b92658a13bdc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL suggesting a lure related to IELTS listening test answers. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure suggests a malicious document designed for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/aws?utm_term=ielts+listening+test+2+car+insurance+answers PDF link annotation
    • https://cdn.sqhk.co/xurawupo/dha8jce/zelaluzeluwibesifududulub.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/wosowir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_6013b3a1e7405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_602282b1a6eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fe42878c7ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_602159eea1af9.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/Mifq4jf/nawexupetorapewago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_5fcd0bc16a543.pdfIn PDF document text
    • https://fasanubuxa.weebly.com/uploads/1/3/4/7/134733786/levawavudu.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/9513983cf7b39d3.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/jodabiladezot/aparajita_tumi_all_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/37551874173.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/95823063031.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/laguxivitutirojaga.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/nukiraduvuziduxodibo.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5128 bytes
SHA-256: c4fe2497f19d6a83c9010244fe1a6d90a35bf544d6c23350c3cffead5f1c36b5
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 14408 bytes
SHA-256: 30380ad34ca2a62b51194356f268fd88cb0ce5f8cec1fc0b722d3df7f1d10172

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