Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0370a5fee6fc3bc…

MALICIOUS

PDF

71.3 KB Created: 2021-05-12 18:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9db55a9fbc748be465b341b12ffd125f SHA-1: c2548d17645cd24e01818fdfe313dfeb88b2da1d SHA-256: d0370a5fee6fc3bcf4dc26bc8a530059d307a36df394e9386509064b0f4b77c0
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 0.9997

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://jottigo.ru/strik?utm_term=how+to+start+jiu+jitsu+reddit PDF link annotation
    • http://grenkasalo4.xyz/what_are_the_15_republics_that_made_up_the_soviet_unionlpyqh.pdfIn PDF document text
    • http://orbitan.fun/who_were_the_first_estate_in_franceqanwg.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/qyDRghf/barbie_dreamhouse_adventures_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/gfhqrUh/broderbund_3d_home_architect.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/0Oggidt/86078012268.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/cSKjjhh/microsoft_teams_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/CgjjuAc/soccer_championship-_free_kicks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memobofilenabon/best_app_to_learn_korean_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/sparkfun_esp32_thing_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45be6c10-640d-440f-9c11-3b21f077dec8/brother_p_touch_label_maker_model_pt-h100.pdfIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_649a834915a44786aea58bc2d6d92840.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mavixu/chitta_jaggi_sidhu_song_djjohal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcd8ad7-b247-4bf7-8d60-4c7e57f6f354/97861222019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a211d857-0dee-4957-a1a9-d80f8555aa39/on_the_origin_of_pcs_download.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_58786c46831c489283477de5c11ae8b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/map_skills_test_grade_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653e7733-8500-4041-ad0e-15075653b436/short_stories_for_high_school_special_education_students.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/wajomupa.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_6aa70f0ec7e747eaa55e4dd1f2712e9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/panibedenexe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 4692 bytes
SHA-256: 62e7ee4f7581555b6bed17462bcee5149da1a8827192ba43c4969266287f5a47
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 10492 bytes
SHA-256: 40f217723364e7eee4b06b7894b4858507aa595df392369880670cbc6f56b8a7
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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