Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372d0dc14c577f6…

MALICIOUS

PDF

96.0 KB Created: 2021-02-19 02:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0548f50e16dcbd240209cc467df15989 SHA-1: 98564993abaf653673ef9d1d29ef027dd05ba4de SHA-256: b372d0dc14c577f62d0f13b9ca38584cc78009b9f9c9e90405988b990c2ad229
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://jacksth.ru/strik?utm_term=jeu+de+cartes+a+32', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains text fragments related to card games and the wkhtmltopdf application, which could be used to disguise the malicious intent. No scripts were extracted, but the presence of external URIs and the overall malicious classification indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=jeu+de+cartes+a+32 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff7792662bbc.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/bghiNje/tinkle_meaning_in_kannada.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/behfgND/16881500124.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/zametasit.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/ieiaoji/pivadelor.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/ccleaner_pro_crack_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/4hcktbG/13_colonies_project_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/6cHghwh/exo_members_oldest_to_youngest_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/Iuhhugh/jakajipaw.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/L0hbget/lolupigofir.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/kmusidY/60164102851.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/FjhiieO/13376046375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zesotat/17540943099.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/bixepilukebidokutelogu.pdfIn PDF document text
    • http://zelekisiwamab.rf.gd/music_books_sinhala_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/happy_birthday_party_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/9974133594.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/47414190192.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/vpn_free_for_pc_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/pu_cet_admission_form_2018.pdfIn PDF document text
    • http://jugikan.epizy.com/80381565167.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 4804 bytes
SHA-256: 451aea31d045706776988f7bf3c2362b3ac2e855b9f7162e3292e99ade283b4e
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 19156 bytes
SHA-256: 9e61b9c068f78516c634fe48963ed657271a59cee8a39953c9e3df264e0e910c
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 12580 bytes
SHA-256: 446c37a57b2e86319991e7cacecffc9e0c244926374af2f8f686048dc78623ae
font_03_sfnt_off00014265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 30344 bytes
SHA-256: bca54cfd4288cfb8f4701784090f25cd04a34dfc408bcbee9b4f6b21f67827e9
font_04_sfnt_off0001628b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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