Malicious PDF — malware analysis report

Static analysis result for SHA-256 e876bdbc5a54de7d…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 11:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1af733d7f174fa0b169397784ee9dc4a SHA-1: 29139427fd091fd9c746142d524a7edf77bc0b79 SHA-256: e876bdbc5a54de7d729e581c80916b8f5df906e3f4269e64927061360a117ada
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The document body, though heavily obfuscated, contains text suggesting it is intended to appear as a search result for '6th grade reading passage pdf', likely to trick users into visiting the malicious URL. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=6th+grade+reading+passage+pdf PDF link annotation
    • https://cdn.sqhk.co/jomububorava/FchgjeN/short_films_pixar.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/jQBgcia/human_life_international_de_souza.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/0gcFkPZ/civil_war_battles_petersburg.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/cBjYPkO/super_mario_jump_and_run.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/ifjhjax/planetary_alignment_2020_september.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_da3407dc33744019b87fdebede60cf9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a30797b-2c42-43ca-9862-ff9cd7ecbbc1/does_your_face_swell_before_labour.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/arcsoft_mediaimpression_2_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/53648574639.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_cb4b8a4b252f406fb7336d023a313aef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/chromecast_for_pc_windows_10.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_7202c781abf24d828d94a7a57788a7a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/another_me_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853c58f4-e3b4-4cff-a126-379335ec6f2d/carl_sagan_pale_blue_dot_quote_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a40263-6ff9-4719-9bed-25644be66cf2/bixetefuxovanuresimab.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/tikagupuz.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_94448d044a39489d9400d0ba68c4c76b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/31930755002.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_206d7af3dcd64e629408f763f4171006.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/8th_grade_physical_science_worksheets.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_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 5332 bytes
SHA-256: 5d0221a45522884f30fcfd7ac933f3629f5dc2ae029c5be4e418c7463cf118f7
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10836 bytes
SHA-256: fe90408e55478863bd77fdefa9f733fc82ac963a5e4a17ac89a1a0f0baf89bba

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