Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa694a2a90af8d7…

MALICIOUS

PDF

91.4 KB Created: 2021-02-09 21:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc81efc81a990b6c5c1ae1da356030c4 SHA-1: 31f337eb701701b64b83aadfb704db8cdb8f8f79 SHA-256: 3aa694a2a90af8d75114407a9b9c43834f827718b8418ea2c0870abab125f259
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://yafferge.ru/aws?utm_term=halloween+math+worksheets+for+6th+grade'. This URL is likely used to redirect the user to a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in the document body is a strong indicator of a phishing attempt.

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
  • 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://yafferge.ru/aws?utm_term=halloween+math+worksheets+for+6th+grade In PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fe4461357de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd2e126a0fa8.pdfIn PDF document text
    • http://vetodegaro.22web.org/51935269325.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/ifDjdTK/download_racing_games_for_pc_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5fe1afe66131d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_600c598bd4073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500677/normal_5fc78b5dd4830.pdfIn PDF document text
    • http://kisiguvawatabom.22web.org/commandos_behind_enemy_lines_pc_full.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/AtCjihe/26670574739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484624/normal_60016a3d70104.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/veledabejufi/xagij.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/i-_864_affidavit_of_support_form_guidelines.pdfIn PDF document text
    • http://bopufadepop.epizy.com/golemalebejidesul.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/khund_bai_brar_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/rotalotidoratatawanerek.pdfIn PDF document text
    • http://sojisij.epizy.com/muvefuzovuv.pdfIn PDF document text
    • http://duzebufulumaw.epizy.com/about_me_slide_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 5592 bytes
SHA-256: 71f22adb3c28a3bfb6fad56c169fabff845567b44ee2c556382b0fa8a121dc3f
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 11676 bytes
SHA-256: e6a54a7694dca8b65d9dcab85218bb04d6bc48c3c5de7aa9797f2b577456c6e8
font_03_sfnt_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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