Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac55e24d2bba958…

MALICIOUS

PDF

88.5 KB Created: 2021-03-31 21:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1018955d65422c4bd8848f9177d9cd91 SHA-1: 7b7607bde2acba32456bd2744c32abeb1088fe51 SHA-256: aac55e24d2bba9583325586cacd2c14d0503156c068759f6a1712dc454cb4964
116 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The embedded URL points to a domain that is likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/wix?keyword=hoover+linx+owner%2527s+manual
    • https://cdn.sqhk.co/wufevinek/gyggjgH/black_friday_sale_online_clothes.pdf
    • http://xikewimuvos.iblogger.org/boss_2_bengali_movie_video_song.pdf
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/540a5.pdf
    • https://cdn.sqhk.co/tijanukubo/YggcJXZ/nenuligujor.pdf
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/1115258.pdf
    • https://cdn.sqhk.co/filodomazora/jPwqGgh/resident_evil_8_ps4_cancelled.pdf
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/1713759.pdf
    • http://rokonagusedat.22web.org/h2so3_strong_or_weak_base.pdf
    • https://cdn.sqhk.co/kigowabalo/8idlKgh/billion_builders_hack_mod_apk.pdf
    • http://welowokekoxifa.iblogger.org/what_foods_can_you_eat_on_the_17_day_diet.pdf
    • http://xerujupuje.sportsontheweb.net/83311013380.pdf
    • http://vekenuv.iblogger.org/gusuvepitagajanimujidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_fa2c6c4bfacf405fbedf3dd1c310805f.pdf?index=true
    • http://visugog.myartsonline.com/30171063124.pdf
    • https://s3.amazonaws.com/wizedumi/identifying_congruent_triangles_worksheet_answers.pdf
    • https://s3.amazonaws.com/latufenaw/12710552838.pdf
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_aa2f188b314d452ba2cee5f3f3824e1b.pdf?index=true
    • https://s3.amazonaws.com/limepusotanal/ms_word_gantt_chart_template.pdf
    • https://s3.amazonaws.com/gagagakigibapo/dujagerop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c8.bin
acf37321785d6b46e51be526451d522e4500dd64d4e658d7d1060eb65e818d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 4848 bytes
font_01_sfnt_off0001112c.bin
3efbe52ccf8b8407d907b70f296cda17bb829aa47842740c600a8116b887065b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 2172 bytes
font_02_sfnt_off00011a9e.bin
0dcb8799b0ce597c6e4baed0e09409eb33b69abb6b47fb5681b04956be2d8661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 13552 bytes
font_03_sfnt_off000144f0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 4324 bytes

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