Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bac36e1c8fa78b…

MALICIOUS

PDF

80.2 KB Created: 2021-02-28 20:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 82673052ff0b4f992e409cef3c3604c9 SHA-1: 693ab7e1c9983d2a9efd9e2c5cece963166f6d54 SHA-256: 23bac36e1c8fa78bf04ef3a3b378f86cc667f207c7fc9e9c63a1c6eb33655c89
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Brooklyn college english 1010 final', suggesting a lure to trick users into visiting the malicious link.

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://zajinet.ru/strik?utm_term=brooklyn+college+english+1010+final PDF link annotation
    • http://bamirajewenexo.medianewsonline.com/text_features_5th_grade_powerpoint.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/69607290371.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/american_cursive_handwriting_book.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/rational_recovery_meetings.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/rexitufozufazimir.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/foturikogukexomeji.pdfIn PDF document text
    • http://greyfruit.space/98430842661v4pvn.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/jifedefujodu/xixodonijapifojabizilu.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/webuzebu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/vazefenibuzafop.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/what_operating_system_used_in_most_of_the_mobile_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/96597441065.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/ben_s_background_remover.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/invertebrate_palaeontology.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/26760222974.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/animated_icon_pack_nexus.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/mi_store_franchise_application_form_online.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/samsung_grand_prime_pro_price_in_pakistan_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/makuboxara.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/my_talking_tom_gold_run_android_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5100 bytes
SHA-256: ed5c3cd90510bbf01188b3e7b5a99dab762a85a30a7d4162758cca8ab2d60aab
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 5552 bytes
SHA-256: 4cbcb5a6840270aacfa158b54a2f4d4b2bc0e0ca66cd50e761e6988836a743d6
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10636 bytes
SHA-256: fcd8ab83d17560990ecc02bbd514bc7f9f59a5e32bbab3c1a4b1362b4fe55c1f

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