Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32b89aaba6d4e7…

MALICIOUS

PDF

71.7 KB Created: 2021-02-09 17:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 90cc6d2f14b6cfbf003a7249f6ea0fbd SHA-1: c253633f89cb1cc79635ad17145cfc9025fad945 SHA-256: 0a32b89aaba6d4e704c311c65643e3b6aed8717242c5767bf787e0c830bc1fe5
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=exercicios+basicos+de+analise+combinatoria+pdf'. This indicates the document's primary purpose is to lure users to a potentially harmful external resource. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=exercicios+basicos+de+analise+combinatoria+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_60203cd5985bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_6018c8a122ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_5fe650417abea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fda7b430fc6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/afthejr/gutscheincode_amazon_kindle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fe1592e18520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_6000d07b4d14c.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/fSFgiSI/plate_number_verification_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490949/normal_5fde59592cc2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fd0db7c96f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/IhbRhhe/iowa_deer_bow_hunting_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/fjdhjRV/puzzle_and_dragons_gold_monster_list.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/vovuzize/37541628145.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/chemical_kinetics_practice_problems_with_answers.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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5464 bytes
SHA-256: 8a713a49fec5719e1552c988be4628a8ddd19aeb882ba0dbdbb4fb1c0f48e67d
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 10948 bytes
SHA-256: 1ada0dd0e68d7e9c87b25675d065f9a7bbc67fda51b9d0bbf5fab3cda3016665

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