Malicious PDF — malware analysis report

Static analysis result for SHA-256 293d43a15c676b02…

MALICIOUS

PDF

85.9 KB Created: 2021-02-18 09:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e10a62efa7cb044bd1d86d9f65bbf46f SHA-1: 8a0249abdb512f581775b9b5b466b22facb56b09 SHA-256: 293d43a15c676b02d6b55be060de8ec26c7b80d5442fb1098cf10c5bd2a39fc8
214 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to potentially malicious redirectors and link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to 'essay writing', likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+write+an+essay+writing+pdf In PDF document text
    • http://naturwows.space/pes_2013_crack_1.04zwq0u.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/8318290.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/liwebenugepa.pdfIn PDF document text
    • http://mon-cmb.best/148886994309tbhi.pdfIn PDF document text
    • http://zoomita.fun/dachshund_colors_blue7oas0.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/9347680.pdfIn PDF document text
    • http://espaceabone.com/sepsis_guidelines_uk_2018cmumz.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/goviwigax/coshh_data_sheets_petrol.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/bengali_movie_sultan_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/calcitonin_salmon_dosage_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/florida_biology_textbook_miller_and_levine_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/sutovuluwa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/mupovifonove.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/2019_calendar_template_with_holidays_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/waze_android_auto_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/maplestory_2_heavy_gunner_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/candidiasis_genital_en_hombres.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/nuvelo.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/pojurekaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/southern_charm_charleston_guide.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_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 5332 bytes
SHA-256: e24a0e93cec16ddf6eec01e9470179fee1324c24c7ecd5a1d2c101539d1d450a
font_01_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10376 bytes
SHA-256: dd9f77e020915c2db56cb16fc190e28cbcc9e5b555bce6c9ceb26059a837c01d

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