Malicious PDF — malware analysis report

Static analysis result for SHA-256 64390e0c4ca4a856…

MALICIOUS

PDF

74.9 KB Created: 2021-06-08 19:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 583121a9a83d319f2240416a5f466f8b SHA-1: 4aef82629839c223e4705da9aa5fe7777d51a47e SHA-256: 64390e0c4ca4a85655d99581a29d123e56c34190180d980c79c90c8e71f2f5e5
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The presence of an external URI pointing to 'krisoc.ru' with a suspicious query parameter suggests a phishing or malware distribution attempt. Although no explicit script was extracted, the PDF structure and heuristics indicate it's designed to trick users into clicking a link, likely leading to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=carrom+pool+hacking+apps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fd0923581b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485434/normal_5fffeb8a422ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_60493a9c63b05.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/4fad76b5-08c9-4593-8559-191bfdd1da7b/how_to_connect_polk_signa_s2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a78382-dffe-4125-bb38-d825dae0bbae/what_is_the_rule_for_adding_the_suffix_ly.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/4850760801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e54946c-d830-4dd2-884c-8bd641829196/how_to_get_gold_in_red_dead_redemption_2_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8e55bb-15b9-4321-bfac-04eb37690c40/60295671778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8252c9-7326-48f4-a492-85e8ab06ba43/reptile_the_2009_manual_of_the_plaintiffs_revolution.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/f/philippine_science_high_school_entrance_exam_reviewer_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fc6d80-62f9-4db5-b551-b416b1c5e1f4/dungeons_and_dragons_online_summoner_class.pdfIn PDF document text
    • http://barotidi.pbworks.com/f/pakistan_hindu_council_marriage_certificate_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067a4656-271e-4435-b028-e964da32d24a/rozuwozen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28899e80-5d52-4ad2-a869-d64458e2ce0d/nezekumikujirunegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9e62bf-cedf-4a1f-86af-6717543a2703/disciplines_of_a_godly_man_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0008efac-b39d-414f-9b6b-ba9398c2341e/rarosejuvefedijosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c203ab-0cc6-462e-94d3-a0bacd773b14/89843662028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b068cd-2223-4b99-b41f-52f3c22c5ab9/dunivajiloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbfd4ca-1792-4674-951d-2fa0f459973e/76845958114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef9667c-4627-4dd1-a25e-5434f532abc5/grand_theft_auto_v_license_key.txt_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044440ef-d6ff-4d2c-9ee7-3de392de6017/research_methods_in_educational_leadership_and_management_2002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a4676e-4cd2-40f3-a4ff-84a4fad23e90/how_long_to_learn_egyptian_arabic.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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5316 bytes
SHA-256: f46ea66359d93adcc99cacf6898d6a469a9736b42bf4b0960705bf06a466c4b4
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10240 bytes
SHA-256: f8c471233b07ecada96aa46662ee4fd3f7d9824fa97c92d3f9139375719db34d