Malicious PDF — malware analysis report

Static analysis result for SHA-256 90116a045f5d591f…

MALICIOUS

PDF

67.5 KB Created: 2021-02-07 06:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74e6eff76e0a01c165f56d84cfcaf7c5 SHA-1: 72b10d1ee75551471677e7a3dd9545429c09b1e5 SHA-256: 90116a045f5d591f5092cb07bc86ce863d72ca915d7449be0c228ed96849e717
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URL `https://crophysi.ru/123?utm_term=post+malone+hollywood+dreams` is the primary indicator of malicious intent, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=post+malone+hollywood+dreams In PDF document text
    • https://cdn.sqhk.co/zidexamuwela/8iahbif/kitchen_fever_pizza_chef_s_table.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/5ib8ypl/difilafiputagogozopajuse.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/2qcn6wH/58521089728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5feff55869ac3.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/IojcZic/51122813080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388279/normal_6003854341bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/bFjalof/wezujesidinerudulowebowu.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/geRgclR/71806276406.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/L99id6j/44555631187.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/nerugiraxura/child_right_reporting_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/38280711930.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/nebraska_football_schedule_2018.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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 5260 bytes
SHA-256: 9f51a24951ce14eabc5d18ec304c954daafbeb9c305a5a8ab04962c9270d2d27
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10708 bytes
SHA-256: 007a9ea84d229caeef82f64838b24fbf1b66c41f96e485f9a56f9665a9ccd08f

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