Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce692985f54dd174…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 07:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4fbc5c395b2a2e69824e28ade5472c SHA-1: 777e54532b90a5177f02a57d8b04bdda65fbb9a2 SHA-256: ce692985f54dd174f6a08a6552890bef266c29f6190a6f3ada232f1fdbc0ad07
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or phishing. The primary URL, https://maypoin.ru/wix?keyword=triangle+interior+angle+worksheet+answers+sheet+2, suggests a lure related to educational content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=triangle+interior+angle+worksheet+answers+sheet+2
    • http://knitfqph.site/seforakab8i.pdf
    • http://winoraama.fun/52972202694srt3l.pdf
    • http://regsen.website/carol_of_the_bells_piano9gjho.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_ca045a3084b34091a2cbf6f6249b80b4.pdf?index=true
    • https://s3.amazonaws.com/jalasilunaz/games_pc_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/2a1a781f-a885-4881-b7d5-33112ec4368c/concepto_de_salud_publica_segun_varios_autores.pdf
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_ac05091d6aa04bc38775c5e33c4b9256.pdf?index=true
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_a06b4f9511464534ad09baac56471f44.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_a76cff23bac94d149c44adfebb870835.pdf?index=true
    • https://uploads.strikinglycdn.com/files/803b12f5-12c8-4dc2-aaaa-1a51fb53c663/ziduwulufaworuje.pdf
    • https://s3.amazonaws.com/setaxilitozuko/enzyme_lab_report_bio_181.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_07bbeee252674e268e3ae4ad45ae845f.pdf?index=true
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_95af8dca83b84c28ae5ff3c9684a5db5.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_fb124e71b0fc44d882b6536842328332.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_94ed65773aed4e7eaac930f921a47b5d.pdf?index=true
    • https://s3.amazonaws.com/napejaxosinages/hexagonal_excel_sheet.pdf
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_a1c59a3ec6374b03a8108abf83cc4e16.pdf?index=true
    • https://s3.amazonaws.com/serogajugomiji/the_5th_wave_second_wave.pdf
    • https://s3.amazonaws.com/tezofuretejom/jomepoxifu.pdf
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_8d4e97b49b7d4dd680788f46fb1a69e5.pdf?index=true
    • https://s3.amazonaws.com/folexapurilowe/cfpb_annual_complaint_report.pdf
    • https://s3.amazonaws.com/zuwosil/answerphone_song_banx.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_off0000f9bf.bin
2bdf934ab2ed136f528b7fdb4760c6706ab9d5fa74873a6817f43b8676680fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 5184 bytes
font_01_sfnt_off00010b70.bin
961b33531499d0fced13aff09bef0bc2a64d94fa4b7b9f2904492d25c91cddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 11572 bytes

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