Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca383a009b520278…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 23:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: df3e71001f5cac7d0baba76d7605fdc3 SHA-1: 989a3d091fb20c1854309f7dc97192c8f46f35c6 SHA-256: ca383a009b5202781c4376c8fb7f27fb9787382955594e706d68d4b0c8b05412
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used to host a malicious payload or conduct phishing. The document body, though partially corrupted, suggests a lure related to educational materials, aligning with common phishing tactics.

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
  • 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://jacksth.ru/wix?keyword=types+of+chemical+reactions+worksheet+answer+key PDF link annotation
    • http://rosutob.getenjoyment.net/watch_hunger_games_mockingjay_part_2_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/csM6uhj/infinite_shooting_galaxy_attack_cheats_ios.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/wetuxotonoru.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/hidIOie/bisemarotogevujevujira.pdfIn PDF document text
    • http://najefot.22web.org/savewujegisuxune.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/05Njbhc/neo_geo_mvs_x_review.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/viregujipowuru/18439970054.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/methods_of_milk_pasteurization.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/78625578154.pdfIn PDF document text
    • http://fiwemigusa.rf.gd/40057018910.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/busewumotisuwifozezuwazop.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/short_stories_nyc_restaurant.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/tazigukilavuvepixixa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/college_graduation_party_invitations_templates_free.pdfIn PDF document text
    • http://kajurilin.rf.gd/icloud_photos_won_t_to_new_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/29745705039.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/mawubelogenegunigud.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/drinks_mixology_guide.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 5464 bytes
SHA-256: d66aeddb78e95a387b2554ed6f1a4032f46a1bec1a86b8fadc0ce9b2ad0fccd8
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10052 bytes
SHA-256: 3ebde775d840e91727af1745751dc709fb58f2b58b9b9fda805af76da50a4331

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