Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5471a4d22ae2d7…

MALICIOUS

PDF

79.8 KB Created: 2021-03-30 13:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ef0ec9064b49eb4cbd5a5ff309476c1 SHA-1: cbaff85990f2a55d9dffb87a2c2e8c9bfb790738 SHA-256: bf5471a4d22ae2d7957d57f1fbcfae48616e34ea3cde09201a6af5aeafa01af1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/wix?keyword=simple+harmonic+motion+review+answers'. This URL is likely used to deliver a malicious payload or redirect the user to a phishing page. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of malicious URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=simple+harmonic+motion+review+answers In PDF document text
    • http://dizititakozazi.mywebcommunity.org/bible_verses_blind_from_birth_of_jesus.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/how_far_can_a_baofeng_uv-82_transmit.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/30274943057.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/jixev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dcef48d-2888-422f-ab86-d79f69d6fb0f/house_of_night_otherworld_forgotten_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/29875512386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccedd687-e962-4957-ab71-9fe41ab2e989/which_online_spanish_courses_is_best.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/tabomexexetasakowobifowom.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/bengali_don_badshah_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9521a874-6cd7-4870-8fd0-a1184d3ea490/is_vba_a_functional_programming_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52174c4-373f-41c7-83ca-4df1faabb8fa/76564349910.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/tujaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/kisavadipotumewojadeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ad7a2-ac27-4207-baca-216b01267357/oracle_database_client_software_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/autograph_movie_video_songs_hd_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca16919-82a1-425c-b1c2-dc147b51e581/fitbit_charge_3_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485b8ed9-0b5d-4870-94d5-7d1816126d6f/67708463899.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/96392803041.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/shark_rotator_nv501_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bexabibigepirar.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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 5428 bytes
SHA-256: f5eedffabd7c4c34e28f5a126af0dc50ba3f78e6fc587a9c2152a4a7833cd42a
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 10888 bytes
SHA-256: 91af42d30a9887d1335f451d03077d1e12a119da72cdeb2f22cc8db718c01d71

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