Malicious PDF — malware analysis report

Static analysis result for SHA-256 1571a69c387b13f5…

MALICIOUS

PDF

92.0 KB Created: 2021-02-17 18:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7fb81dd0ef033b8dff5a586fa469ddba SHA-1: 063694da4d93b14ea313f0e46293080bda0eea01 SHA-256: 1571a69c387b13f51ad31138ad91e29fbd5e3298a29fb975b02f799a9048c2cd
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=what+is+ethics+of+justice'. This URL is the primary indicator of malicious intent, likely leading to a phishing or scam page. The ML classifier and ClamAV detection further corroborate its malicious nature. No scripts were extracted, but the embedded URL is sufficient to classify this as a phishing attempt.

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=what+is+ethics+of+justice In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5fedd222c6351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5ff633f8cae55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fe2ba2f413c8.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/jijubitideledozojuiulqe.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/numegubowalonan/chrome_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/64223169945.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/guru_mann_keto_diet_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/make_your_own_podcast_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/80097920285.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/33357124122.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/48839085698.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/9379610684.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/42567568414.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/93368174068.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/81501569060.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_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 4932 bytes
SHA-256: 36650748dc926d5066ccf43159262bf2616e6fc0af5d06c4d5fa56822397bf17
font_01_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 10384 bytes
SHA-256: 867bf050d91407d967ec47851dc3892932a14ae7de01ead8fdc6b39f4a8d66c0

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