Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592985d31efb283…

MALICIOUS

PDF

75.2 KB Created: 2021-03-31 11:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27430e54d1d9a4981e7d3485e34d9ce0 SHA-1: a0f5d6847ffd665637d7fd2fcfaf744d5de50d2b SHA-256: 2592985d31efb2830ebbf79b1d338e2d92c8476852eb27cebf0ff7ce416cc438
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://pelibifir.ru/wix?keyword=buttonball+lane+school+staff+directory', which is likely used to deliver a phishing page or a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a staff directory.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://pelibifir.ru/wix?keyword=buttonball+lane+school+staff+directory
    • http://woronari.getenjoyment.net/96161055512.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_6041f5f966a97.pdf
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff46e1c5d1c8.pdf
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fccb6224ee64.pdf
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fc954ee51c35.pdf
    • http://tevaruv.sportsontheweb.net/65959871811.pdf
    • https://cdn.sqhk.co/vanewano/gdUgf0f/zatevuguda.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6030588964a2d.pdf
    • https://cdn.sqhk.co/kupujape/hhvQjfm/64387138028.pdf
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fdfa200d05aa.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_600fe4db73b89.pdf
    • http://tunewejewuz.mypressonline.com/face_reading_book_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fdbdafcdff89.pdf
    • https://cdn.sqhk.co/zegofurop/fij0jdA/planet_life_crazy_games.pdf
    • http://jiteruruw.sportsontheweb.net/31062871577.pdf
    • https://cdn.sqhk.co/nuzinipaz/DicaRYn/76631196792.pdf
    • http://naxajogilelog.medianewsonline.com/adventist_church_hymnal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dusameferadulo.onlinewebshop.net/85468146755.pdf
    • https://uploads.strikinglycdn.com/files/0530dc85-5fbf-4b97-9991-033d912c0f31/how_to_edit_vertical_video_imovie_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/a13d93be-b1a0-4bec-b1b0-cd703d9a95ff/wenuwanabirixuguxelex.pdf
    • https://uploads.strikinglycdn.com/files/1742711a-ee2a-4b42-9b7a-97e9b7256355/31279061064.pdf
    • http://zejibanunepi.myartsonline.com/present_tense_word_for_listen.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_off0000e7bc.bin
b1aabd2c868f8771630efeacef4b32b25a3098a0c41086dce1f39e8e23102898
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 5400 bytes
font_01_sfnt_off0000fa13.bin
c881403f60ba77440a3dcfa1900e18ede647e4aa820d06a837fef391792fd337
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 10880 bytes