Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9348f9b87f56b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 17:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f65f2fcc807a552a5d2ffe180bb9ffea SHA-1: 1ffd31ff9d34edfcea0d93b10192003c42720017 SHA-256: b8f9348f9b87f56be37fce9920084c39779b7d85eb011f1813b59c74b16553e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, with one prominent URL being https://seumenha.ru/award?keyword=building+maintenance+system+pdf. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to host or redirect to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=building+maintenance+system+pdf PDF link annotation
    • http://zodelem.mygamesonline.org/does_new_york_have_high_crime_rate.pdfIn PDF document text
    • http://lunesygets.xyz/firovelodaxudinevibebe1wa14.pdfIn PDF document text
    • http://ig-soft-team.com/16627264233leuzq.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/song_of_solomon_chapter_10_litcharts.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/how_to_be_successful_special_educator.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/kulinisokakewi/torabowarelibizej.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/section_8_nyc_rent_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/anatomie_l_appareil_digestif.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_ef0de29de2ce4a1d8c82148e6ba6c86d.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_a4d5c46534e3452fb4fc4d50184bef62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tudawufed/billboard_200_songs.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_hard_is_gre_quantitative_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/2775465918.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/kool_aid_man_face_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/22610988273.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/busy_busy_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/free_printable_consonant_blends_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/survival_gear_for_alone.pdfIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_eb41a22744b246e39b95383b4d591bd0.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_1194cfb169584b8fbca968380f201eaf.pdf?index=trueIn PDF document text
    • http://jezevenakos.myartsonline.com/towuxokepibilu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/86704196629.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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 5532 bytes
SHA-256: b68bba26a1880ad07a3334986df64eed606b4a5b07fb5302b6986bc804bc6c9b
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 9884 bytes
SHA-256: 3f7ab026a80e54f09340bcece1b3e08d9f7943bba63622977e5eedbe2c4bf9d8

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