Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bdfcec92cd2caa…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 22:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebf7f0f42db773dffb3e5379de1b661f SHA-1: 7b7c715b42ea7c70dc48e3fb02990a1db88ccd15 SHA-256: 26bdfcec92cd2caa4587d3a5562e0ac69ae86262b25726bdbdd18f79c73e040d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/award?keyword=speaking+sub+skills+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded malicious URL is the primary indicator of compromise, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=speaking+sub+skills+pdf In PDF document text
    • https://cdn.sqhk.co/giganopof/5iejbFM/weapon_mastery_new_world.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/hvibtl8/arkham_knight_riddler_informants.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/1fieljg/beach_buggy_racing_2_shortcuts_crab_cove.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/rgeidhb/wechat_application_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/OQghGic/16829082314.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/fC3ajiG/fasefut.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/g7T0ghe/super_bunnyhop_hunt_showdown.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/gc3igjf/preschool_business_plan_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c56c5ee1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/AviMggT/the_three_musketeers_by_alexandre_dumas.pdfIn PDF document text
    • https://cdn.sqhk.co/pimetezefo/dliihjv/gigabyte_smart_manager_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce6e6c0df4.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/jzODif5/texukubu.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/igixehf/top_10_rock_songs_about_love.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/6DifxjW/short_men_s_haircut_with_beards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5fc8954b7c365.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/rikolesafuwofar/domidemuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2839c4-752c-40fa-82ef-3e226142e094/how_to_program_your_xfinity_xr2_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347923b3-7cbe-46e1-80bf-057a121d5c59/fezulidupalitebikof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c376898-bfd9-47b9-ab25-311ac733feb5/nicholas_sparks_books_in_chronological_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4b2c86-5b7f-43e7-95ee-1590b30f05bb/how_to_cash_a_cashiers_check_at_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/88861134984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e95b46a-3165-4724-bed9-ad72c30b1b47/was_the_great_society_good.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5420 bytes
SHA-256: e98f2fee64f11ab4f59e1861244c2cc4e5da387eabe11d70deb367920960601e
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10472 bytes
SHA-256: ecf89e2cd896ea66dfa6249d33e48b06fa19ed863016e241bc586fc03c7cb83f

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