Malicious PDF — malware analysis report

Static analysis result for SHA-256 9decb39b4942cc8f…

MALICIOUS

PDF

72.8 KB Created: 2021-04-29 19:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04429c43b11554f9d2ccf6a0e90d3af6 SHA-1: 927d56aa566ca7988963bc72491d136f7cc9a275 SHA-256: 9decb39b4942cc8fc2bfe7e05156556f687ebcbb56debd6b0c55dcb131b9bb38
156 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 ClamAV and 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 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://dafemum.ru/strik?utm_term=computer+hardware+training+institute+in+delhi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369646/normal_605174414fc06.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/bathroom_designs_for_home.pdfIn PDF document text
    • https://cdn.sqhk.co/dowotovewi/irEhjIT/xokifuvifu.pdfIn PDF document text
    • https://cdn.sqhk.co/pomijatan/jihieGN/ball_resurrection_game_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_603c69e2aa9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_60297c7b40809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd72201e7481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_0bc10ea2749444078b7a0573acadb29c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wisuw/xuzuxelesuruxopukekor.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/aged_care_guidelines_nsw.pdfIn PDF document text
    • http://galiwasik.rf.gd/adding_subtracting_multiplying_and_dividing_negative_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/tejipaxubezopibobarifeb.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/netirolefusilefe.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_e05e507062fb4158b2c26478a40bb847.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/cellulitis_or_abscess_formation.pdfIn PDF document text
    • http://matoros.epizy.com/apeman_a79_manuale_italiano.pdfIn PDF document text
    • http://jagaxuvu.epizy.com/mere_apologetics_alister_mcgrath.pdfIn PDF document text
    • http://jokokitot.rf.gd/17489167589.pdfIn PDF document text
    • http://mixezized.myartsonline.com/infant_emotional_development.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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 5368 bytes
SHA-256: c16315664df53d16f37cdb4425feb546fa56db1f0ee9ebe13bbf591afbc598eb
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10700 bytes
SHA-256: cb69f65630836701eea43bae24b9bc6a2095446ec96c3bad2b5ff140d59883ac

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