Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a6c2637de19277…

MALICIOUS

PDF

102.6 KB Created: 2021-04-01 16:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4453579338ffefa98d0f8acd91d7bbdf SHA-1: b5549dd8a9d53563e4567c44a2c020566c65adf0 SHA-256: 24a6c2637de1927777f3e861e6eade161e4878d4029eaf0483a5fcdc86a78ac8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'https://maypoin.ru/wix?keyword=flocabulary+unit+9+answer+key', which is likely used to host or redirect to malicious content. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=flocabulary+unit+9+answer+key
    • https://cdn.sqhk.co/pebekaja/Fghha2K/free_fortnite_account_information.pdf
    • https://cdn.sqhk.co/tumupowe/iNXiipq/2831572657.pdf
    • http://jakesubinosol.scienceontheweb.net/9592407483.pdf
    • http://zukirudon.mypressonline.com/polaje.pdf
    • http://siwupezomejen.getenjoyment.net/category_theory_for_programmers_bartosz_milewski.pdf
    • https://cdn.sqhk.co/fagaluwozez/hdTTPjQ/soxerovaxuwalep.pdf
    • https://cdn.sqhk.co/zikufivol/gfihr2r/tepemuvomika.pdf
    • https://cdn.sqhk.co/nebuwaxisiw/ijjdhj2/sakisutejelopije.pdf
    • http://nujagexurej.medianewsonline.com/sansa_clip_zip_replace_battery.pdf
    • http://jalazekesofijot.medianewsonline.com/nolutazewaworeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0687e8f-3e34-420e-b376-b30c73219546/surah_mulk_full_bangla.pdf
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_de64ce9fef7441a9adcbe3c48d9172c9.pdf?index=true
    • https://s3.amazonaws.com/paxunu/ambasamudram_ambani_full_movie_hd_tamilyogi.pdf
    • https://uploads.strikinglycdn.com/files/6625273d-88db-449e-b294-4ca78f284c3c/fedaj.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_48d6b194d6d3455982dc5ad5539bf4ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e1b9daa-74ac-470e-b298-f87997d4ac33/4954629339.pdf
    • https://s3.amazonaws.com/zevutebulaworel/accor_hotel_financial_report.pdf
    • https://uploads.strikinglycdn.com/files/1ba86544-9ade-407d-8207-77c9f74a4fef/where_is_the_furnace_limit_switch.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/acrobat_x_standard_edit.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_343b1dc49b8342a3b0dd86dea0f3e9b2.pdf?index=true
    • https://s3.amazonaws.com/fotepopunaj/blackmagic_design_atem_television_studio_pro_manual.pdf
    • https://uploads.strikinglycdn.com/files/c964b818-7ba7-4f88-974f-4e2e0d9e09ae/computer_science_books_price_list.pdf
    • https://uploads.strikinglycdn.com/files/766f88d7-1fdb-4c20-b08a-899f09d21b0b/dexowanoziv.pdf
    • https://uploads.strikinglycdn.com/files/de28cf39-6f28-44c3-8901-688094715db8/45077710801.pdf
    • https://uploads.strikinglycdn.com/files/e27ad4f1-6e0c-4e5b-8588-a6c923b62369/verbal_reasoning_test_2nd_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001535f.bin
552394a15e9b02626043ce904f5fa817afc1bf6275cc819711bd9c6edf630232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 5304 bytes
font_01_sfnt_off00016594.bin
9dfa0a110cd3ab0861d8f40c1a2380c330768218f210e9fabdde2df5479641c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16594 11276 bytes

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