Malicious PDF — malware analysis report

Static analysis result for SHA-256 958559c854c2d5fd…

MALICIOUS

PDF

71.6 KB Created: 2020-12-25 10:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27316d780eec6e186f161c357e24802e SHA-1: 80010eab30edc2a8327f298c678dd1cf89644550 SHA-256: 958559c854c2d5fdfd616bbf66b698d464b54e1fc4f8644b210e11701d1966c1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=hillside+veterinary+clinic+marketing+plan+answers'. The document body, though heavily obfuscated, appears to reference 'Hillside veterinary clinic marketing plan answers', suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

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://cctraff.ru/aws?utm_term=hillside+veterinary+clinic+marketing+plan+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fdc164552860.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/zgcijIV/minimal_escape_stage_2-_1.pdfIn PDF document text
    • https://cdn.sqhk.co/suxugipajepo/hhcibhc/fold_up_bed_into_chair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_5fdac7bba9cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/hdFOjdo/rerasopem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fb42d99a4238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f964182977f9.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/sizadagazagaj/45452897087.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/ken_follett_century_trilogy_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/fowopomajuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d45730-fe0f-4a3f-8839-f5a9386feefe/79301786703.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/test_pc_speed_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d0d2bf-98cf-4e3c-ae75-0d8e11fb72d6/luray_caverns_discount_tickets_giant.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/a_vs_b_form_dna.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/bomb_it_4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/gonococcal_urethritis_european_guideline.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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 5672 bytes
SHA-256: c2f3eb9179154b3e1ade1b5d8b7892b2e2e7b17e19991109d2789191210d8ad7
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 10500 bytes
SHA-256: 5a78ce0f80e8273d54ecff598d889db10c4f16cb7f0cd1d83e16d9fb80f790fe

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