Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ba3fb9803005eb…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 11:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e1cc7f23d0bed8f2fc9c3a28cc0f24c9 SHA-1: ae784904ef6324ee66ccee7fa58d6ba9ca61415c SHA-256: 86ba3fb9803005eb4f973b5bbf0bb188529a3058927ed800ce2f66ade786ebe2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/aws?utm_term=dressmaker+2+sewing+machine+set+up'. This, combined with ML and ClamAV detections, strongly indicates malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest the document is designed to lead the user to a malicious site, likely for phishing or to download further malware. The document body appears to be corrupted or heavily obfuscated, preventing analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=dressmaker+2+sewing+machine+set+up In PDF document text
    • http://uscarinsurance.info/73017485859jr5xs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384851/normal_5fc75ac2c104e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_600ffb97dd852.pdfIn PDF document text
    • http://jegepev.22web.org/erectile_dysfunction_guidelines_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_600f36a516509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ffb66bf5daf8.pdfIn PDF document text
    • http://bahis-sikayet.com/let_s_vegas_slots_mod_apkbnhjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_6008de7a26a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6028a963c4144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ffd019ed83f8.pdfIn PDF document text
    • http://furniture21.online/catlogo_jequiti_em3u8hw.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/debamijizozexo/81511283008.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/cotton_polyester_sheets_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/49713600126.pdfIn PDF document text
    • http://liviwofuxa.epizy.com/why_does_stella_not_believe_blanche.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/2353136831.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/b_e_o_full_form_in_kannada.pdfIn PDF document text
    • http://lurosanonit.epizy.com/sps_commerce_acquisition.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5600 bytes
SHA-256: 3bbfb288fdbe8db7c7f9322177beb6b79b5dee8943efc5d09cbf635db2d44a52
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10908 bytes
SHA-256: 1413810f329dc3fc48de86dcbb504f427d0f3de24db398d5468f58fcb2de95fe

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