Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c84a9c97d81b7b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 02:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e1bd26cb720ecb7322978793f0fd018 SHA-1: aadf3e67b7c03f5f62f5643591691738e5836cf3 SHA-256: 55c84a9c97d81b7bfe62ca0f1e715c30caedeabdd9d3da986c5a6ee28b12dd17
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of a malicious URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further indicates a potential callback phishing or tech-support scam pretext, although the document body is heavily obfuscated and does not provide direct textual evidence of this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=dj+aisah+bukan+kaleng+kaleng
    • http://shoop-ff.ru/for_a_new_liberty_murray_rothbardnst9h.pdf
    • http://esclick.pro/best_buy_cordless_phones_for_hearing_impaired27yf0.pdf
    • http://ruvujagefeko.mygamesonline.org/fusawuvobizit.pdf
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/2290331.pdf
    • http://fukijuwevo.getenjoyment.net/dofijitonizuweda.pdf
    • http://pewekelexu.mygamesonline.org/google_borg_paper.pdf
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/2ea2ea27.pdf
    • https://tigamapelexoka.weebly.com/uploads/1/3/4/6/134633170/6d6c498.pdf
    • http://rasezatoxefu.mygamesonline.org/home_security_cameras_with_iphone_apps.pdf
    • http://pizozajo.iblogger.org/the_other_side_lyrics_sza.pdf
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/6366365.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesufiwonelu.epizy.com/59363295876.pdf
    • https://s3.amazonaws.com/farefasejikap/antares_autotune_8_plugin_free.pdf
    • https://s3.amazonaws.com/bidivo/sway_michael_buble_sheet_music.pdf
    • http://denefarow.rf.gd/83091561780.pdf
    • http://rexefobixavater.myartsonline.com/vias_administrao_de_medicamentos.pdf
    • https://s3.amazonaws.com/befafuni/26949646826.pdf
    • https://s3.amazonaws.com/rewepalazamiso/14844753960.pdf
    • https://s3.amazonaws.com/rokuwapesu/nirewazekoxoxidarupuzal.pdf
    • https://s3.amazonaws.com/luramamelolem/mass_forming_cholangiocarcinoma_mri.pdf
    • https://s3.amazonaws.com/jemisajoda/80652311447.pdf
    • https://s3.amazonaws.com/mukut/kawapivojudosafazebupu.pdf
    • https://s3.amazonaws.com/tazibabebamep/11136099510.pdf
    • https://s3.amazonaws.com/bodajaku/geboxegegigiwimugikir.pdf
    • http://rokuwesepetab.rf.gd/zavufisoxixasibet.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001085c.bin
328d5d799a407afd969aa77282992c6b54d0b782f1c2264509fa0879234cf3df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1085C 18060 bytes
font_00_sfnt_off0000d434.bin
c13b3cc5be65f88c82c38174bbe50ab46b35b13644fd0630a3cc6027caaf1b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 5132 bytes
font_01_sfnt_off0000e5b9.bin
78e74a61b17528ccb385733f0fdf3674a252278583e59148173a7e62bfcc0a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 10108 bytes

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