Malicious PDF — malware analysis report

Static analysis result for SHA-256 3287e99b975b7f40…

MALICIOUS

PDF

70.0 KB Created: 2021-04-07 22:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb4651b38854f15d5af2e94801ea8423 SHA-1: 50933f6b533e0a581f744e8c2414d1a4e134a741 SHA-256: 3287e99b975b7f40c040fe5a53e973077b1090a9f8a64bd01b1304323d76a2d0
156 Risk Score

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 0.9997

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://seumenha.ru/wix?keyword=arte+am%25C3%25A9ricas+fresno+ca+93721 PDF link annotation
    • http://indital.space/a_cuanto_equivale_una_pulgada_y_media_en_centimetrosek211.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/bikared.pdfIn PDF document text
    • http://supermagazforsale1.xyz/minezijozejodubzs7s.pdfIn PDF document text
    • http://doucheapp.xyz/93560782569218jy.pdfIn PDF document text
    • http://italy-small.space/98248973460barje.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/2508756.pdfIn PDF document text
    • http://the-glow.ru/dungeon_siege_2_build_guide4x1bw.pdfIn PDF document text
    • http://tomandbxof.site/math_book_grade_8_uaevy5ef.pdfIn PDF document text
    • http://vquest.website/what_is_the_meaning_of_female_pimple_in_hindipngvu.pdfIn PDF document text
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/1358524.pdfIn PDF document text
    • http://skameyki.club/classroom_jobs_freemb0dn.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/vabedafozo/robobozibokosemarusinimi.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_34940c58af03486e8ae0322702f29679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/butterball_deep_fryer_xl_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/fesivefinagopifenano.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_df1e234abbaa40029b5ebe08891a9437.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/21318713682.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/wahl_lithium_ion_trimmer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/sixth_sense_technology_ppt_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/divotimitajewawopemo.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 5712 bytes
SHA-256: 85ab591487b33f0958e5a3d815ad1e3991f9a6fe1a0b47a1dd082efee26733fc
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10884 bytes
SHA-256: 4cf73fae3e43ab7b7e334fc8d5eeb62c34c7fe953fe069088f575e551d655095

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