Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2c16239fdc9979…

MALICIOUS

PDF

80.1 KB Created: 2021-02-24 01:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56b3b830b296f98020e5cf5f3c058838 SHA-1: f2f18d98c782a2251052817a1b0c20458a5509fe SHA-256: ca2c16239fdc997977bdc957b81ef42551c31597481d6f77a52a7d192be0f471
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to a Samsung Galaxy S5, likely a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=samsung+galaxy+s5+mini+at%2526t PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390383/normal_6004a5fb0764a.pdfIn PDF document text
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/3147704.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/gizup_sukekawoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_6034427784d34.pdfIn PDF document text
    • http://winoraama.space/just_wanted_to_say_hi_bernie40q3c.pdfIn PDF document text
    • http://getdouche.xyz/profusion_19_tower_ceramic_heater_reviewszbma7.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/ejeau6U/hello_neighbor_hide_seek_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_6001efbf41594.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/nesute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fc9402807c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5fc80bf5da085.pdfIn PDF document text
    • http://klossheff.xyz/court_reporter_salary_in_south_africa95gfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_60112017d957e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_60333959c0841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_5fe7fb2ca7c71.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/ioVquji/download_beach_buggy_blitz_mod_apk_revdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448740/normal_5fcbcaa224c4c.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/nYgdBii/uefa_champions_league_table_2018_19.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/gumegulaxi/26669556830.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/14219454682.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/albert_einstein_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/totaline_thermostat_change_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/dna_replication_diagram_worksheet_answer_key.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_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 5308 bytes
SHA-256: 6ec19495b061537208596c1aa492f31e4b7d3525c4cde422be954029ee697bc2
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10716 bytes
SHA-256: 4a08ba0945950fb860152dc2adafbe479119540fc9f278f4521a54b05a4c065c

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