Malicious PDF — malware analysis report

Static analysis result for SHA-256 e051ebdf9d5a7960…

MALICIOUS

PDF

42.1 KB Created: 2020-11-07 03:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6c0100406c0e81d50a58b82e3c98b832 SHA-1: 16f5b399b57321a1df1d00be9ac160f77c3a2e8a SHA-256: e051ebdf9d5a7960b9ce69d4d1dbbd2055260dec232cbda9912d8a5a7d3f25cd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/123?keyword=sadlak+national+match+spring+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467285/normal_5fa33d297fb5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fa1d875c3929.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/gajonituruxid-fapudurodexuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8b3e5e7e4e7.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/maxunejekiz-wesuxa-vudiwuxapaxefa-garixaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5fa5eb10032a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f93a0fe8cc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f873c793f007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f917eeb3d474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gelolote.files.wordpress.com/2020/11/zukizugamun.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/patterns_in_division_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/jemesibesilisus.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/17657460419.pdfIn PDF document text
    • https://kixazeg.files.wordpress.com/2020/11/14585715478.pdfIn PDF document text
    • https://diguzijemo.files.wordpress.com/2020/11/46627787380.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/kikijuvepon.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_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 5652 bytes
SHA-256: 7d53037e6cd1acb5137af41ff4263e09a844b6db85ff3cb2500cf7ab18dd16a4
font_01_sfnt_off000074bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 10916 bytes
SHA-256: 5119ec1d2f3743ad275e6fbd37ad9c0592b80712858808ef0f996a4c1b1a8161

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