Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d6579e492fa5d1…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 00:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7bb4e476b082d35b5814d746a95b5a13 SHA-1: 6ce65d5c3ce2430b3207daec2568816f8710770d SHA-256: 17d6579e492fa5d1a0cf8b8db4540122027461b009236046b46e6c0c80fa7403
154 Risk Score

Malware Insights

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

The file is a PDF that contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged it as malicious. The embedded URL points to a suspicious domain, suggesting an attempt to lure the user to a malicious site. No scripts were extracted, but the PDF structure and URL are sufficient indicators of malicious intent.

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=5+different+text+structures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_601ac6e2c4015.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/jfQeifP/54701497032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601cdfc100ed5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_60054bdd45fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_5fc7d6b5dc43a.pdfIn PDF document text
    • http://wopafopu.22web.org/real_estate_debt_capital_markets_jobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5ffd6bb5ba7e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5ff75774790d2.pdfIn PDF document text
    • http://zobebukore.22web.org/digital_multimeter_dt9205a_manual.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/glacier_national_park_backcountry_camping_guide.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/wibedubosateg/fupufikediba.pdfIn PDF document text
    • http://nilidori.rf.gd/educake_test_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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 4872 bytes
SHA-256: 76fb87b5d3513f318b6db0278fe50412aaeb678397e1d6de6d5c1b4c24ca3d2b
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 10652 bytes
SHA-256: ca7753193b8fb6f8926173954322917b87e208157f202b54b8cad8afab47f826

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